When comparing GDevelop vs Construct 2, the Slant community recommends GDevelop for most people. In the question“What are the best 2D game engines?” GDevelop is ranked 2nd while Construct 2 is ranked 13th. The most important reason people chose GDevelop is:
The whole interface is intuitive and easy to learn: each part of the game can be designed using visual editors. The objects editor is used to create the objects of the game, the scene editor help you to build the levels of your game and the events editor allows to give life to the whole game without programming.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easy to use
The whole interface is intuitive and easy to learn: each part of the game can be designed using visual editors. The objects editor is used to create the objects of the game, the scene editor help you to build the levels of your game and the events editor allows to give life to the whole game without programming.

Pro Free and open-source
GDevelop's runtime libraries are MIT licensed. It can be used freely for projects of any type and there are no royalties associated with publishing games developed with GDevelop.
Pro Powerful events system to create games without programming
No need for coding using this system which is clear and powerful: events are composed of conditions and actions. Actions are launched when conditions are fulfilled.
This is a very friendly way of making games and is still efficient for advanced usage, contrary to most other "block"/"drag'n'drop" systems.
Pro Open source plugin SDK
The plugin SDK is open source, so if you want to extend it, you can.
Pro Lots of features to build games
The engine includes pathfinding, physics engine, multitouch support, custom hitboxes, platformer engine, tiled maps, multiple layers and cameras out of the box.
All of these features can be used without programming knowledge, using the visual editors.
Pro Quickly add behaviors to objects
Prebuilt behaviors can be added to objects. This is a very efficient way to add a physics engine or make a platformer game. Lots of behaviors are included, from the most advanced (Physics, platformer, top-down movement) to really simple one (like the behavior to destroy objects when outside the screen or the one to drag objects with mouse or touch).
And you still have full controls over your game as behaviors can be modified using the events!
Pro New documentation for gd5 is good for starting
A new doc is improving for gd5 that is nice for beginners and after that you can learn more from examples. Also, gd4 wiki is still there.
Pro Constant updates
New releases and bug fixes are consistent. New updates are released anywhere within 2 weeks or 1 month from the last one. Its auto-updater also does it job very well making life a lot easier.
Pro Online version available, compatible with iOS and Android
Thanks to its open source nature, GDevelop-App.com was built over the GDevelop engine.
GDevelop-App.com is a complete game creator similar to GDevelop, available directly in your browser and compatible with iPad and most Android tablets and phone! The app is perfect for making games directly from your sofa and you can even start a game on GDevelop-App and export it to open it inside GDevelop.
Pro Multilanguage support
GDevelop is available in many languages and even community can help in translations.

Pro Quick to pick up
Construct 2 is fast to pick up, get into, and belt out some pretty impressive games in a relatively small amount of time. Seems to be built for people who don't have a lot of programming skills, but want to make great games.
Pro Simplicity - it is made for everybody to use and love
Construct 2 is a tool for not just programmers, but artists as well. You can create a game with only visual coding, which is easy to learn and doesn't require any previous programming knowledge. You can focus on making your game better instead of just coding. It has some limitations of course, but it's definitely worth it.

Pro Little programming knowledge needed
Using Construct 2 requires very little programming knowledge because it's all drag'n'drop, intuitive, visual and event-driven instead of code-only.
Pro Built-in physics system
Thanks to the great power of Erin Catto's Box2D, Construct 2 is able to make physics games which are similar to Cut the Rope and Angry Birds.
Pro Cordova support
You can use Cordova plugins from the community
Pro In-depth event system
Construct 2's event system allows for deep, detailed control over all aspects of your game. You aren't limited to just a few options. Rather, Scirra has thought of nearly everything in advance with access to any desired parameter of any object all paired with simple and intuitive ways to interact with them.
Your events can be organized with event sheets (that can be included in other sheets), event groups, sub-events, loops, and functions that make the coding portion of your game as efficient as possible. You don't need any programming knowledge, but if you do have some, you'll feel right at home with the freedom C2 offers.
Pro Supportive community
Construct 2 has a supportive community. Their forums have tens of thousands of topics with ten times more posts. The core maintainers are very helpful and friendly and often reply to questions or issues that may be discussed in the forums.
Pro Easy to create particles and animations
With spriter file implementation and internal animation editor Construct 2 provides an easy way of creating particles and animations.
Pro Free (feature limited) version available
A free version of Construct 2 is available. It's not time restricted in any way, but is feature limited.
Pro Active plugin ecosystem
Construct 2 has an active plugin ecosystem providing behaviors and features that smooth the workflow for certain game types.

Pro Export control for all major platforms
All platform exporters are part of the subscription. There are no additional fees and new exporters are added quickly and maintained well. Currently, 15 platforms are supported, including HMTL 5, iOS, Android, Windows, Chrome Store, PhoneGap and Scirra.
Pro Built in behaviors make development workflows very efficient
Behaviors add pre-packaged functionality to object types.
Pro Very fast preview
In Construct 2 you can preview your games instantly at any time. There’s no need to wait for compiling or other time consuming processes.
Pro Available on Steam
You can also download Construct 2 on Steam.
Pro One-off cost
It's a one off cost for Construct 2 and all updates to the Construct 2 editor are free for life.
Pro Supports camera, microphone, speech recognition and synthesis
Can use cameras in PCs and on mobiles. You can use the synthesis that can recognize your speech or you can write something and it can talk for you.
Pro Interface similar to that of MS office
This engine provides an intuitive workflow for people that are used to the Windows environment.
Pro Runs great on mobile
Performs well on most devices and browsers.
Pro Rapid development
After using a few quick tutorials you can quickly catch on to the event system this program uses and quickly be able to build any type of 2D game you want. You can download a few sprites from google and put together a working level of Mega Man with character movement / animation / enemies / collision detection / scoring / Tile map and AI within about 2 hours.
The built in behaviors are incredible. It's amazing how Construct can simplify the most redundant tasks in game development.

Pro Allow server-less multiplayer game creation
Construct 2 uses WebRTC technology to support it's multiplayer functionality. The nature of the technology allows peer-to-peer connection which does not require game developer to create server side architecture to allow communication between games.
Pro Supportive devs
The developers are always available to help.
Pro Built-in animation/image editor
Basic sprites and tiles of 2D games can be made with engine's built-in tools.
Pro Built-in pathfinding
Has built-in solutions for pathfinding.
Pro Built-in tilemap object
The tilemap object allows tile-based games to be designed more easily. The object's tilemap can also be edited in the layout view using the tilemap bar.
Cons
Con No support for atlas/tilemap and sprite sheet
At this point, you need to separate the tileset maps or character animation sprite sheet before importing it to the engine, but the developers are working on this feature.
Con GUI is slow to load
This makes doing the simplest things, like looking at one of your maps, hard to do. In looking into this program, it can stall a PC while trying to load a sample map.
Con No 3d, not even fake 3d
This is a 100$ 2d-only game engine. You could of course use pre-rendered 3d graphics, but your games themselves will exist only in the x and y axes.
Con It's very slow
Although suggested otherwise, GDevelop doesn't compile the games - it just adds wrappers so each OS can run the HTML5 game it creates. That means it runs much, much slower than other engines that do compile games.
Con No cross-compiler
The Windows and Linux versions of GDevelop can each compile a native application; but the Windows version cannot compile for Linux, nor vice versa.
Con Optional subscription not mentioned on main site
While the engine is free and open source as stated on the main website, it does not mention that some optional features and services are actually activated through a paid subscription (two tiers: 2€ and 7€). Those features are: no nag screen shown when debugging, additional metrics available on games dashboard, access to more than 2 cloud exports per day (unlimited local export can be done without subscription, provided the right packaging tools are installed and configured), easy removal of GDevelop splash screen (can be done manually without subscription).
Con Behaviors of Objects are rather generalized
Since it has a fully GUI editor, the objects you are allowed to add in your game are pretty generalized (PhysicsObject, TiledSprite, PlatformerObject, etc). This limits the freedom of a game developer while making a game, as the object msut follow the preset behaviours imposed on it.
Con Poor mobile performance
Construct 2 is focused on Javascript. Javascript isn't as fast as native code, which results in poor performance on mobile.

Con Free version is severely limited
Although a free version of the engine is available, it lacks features that are essential to creating a high quality product.
Con The editor is Windows only
Although Construct 2 is able to export projects to Windows, OS X and Linux, the program itself currently only runs on Windows.
Con HTML5 is very dependent on browser performance
Theoretically all browsers should run HTML5 pretty much the same way, but thats not always the case.
Something that worked fine on Chrome, for instance, might malfunction on Firefox (or vice versa). And there's nothing the devs of Construct 2 can really do about it, but to hope next Firefox update might fix it. Internet Explorer is not even recommended.
Add to that the fact that exporting to mobile or desktops rely on these sort of stripped down versions of web browsers (Node webkit, Crosswalk, Ejecta) that you pack with your game, and you can have a real headache if you're trying to make your game work properly through multiple platforms.

Con Does not export to native mobile code
Construct 2 builds to HTML 5 only, which can cause performance issues on mobile devices depending on the HTML5 engine that the OS is using since that will be the biggest bottleneck. Even though it's not really the engine's fault, it still is at a disadvantage compared to native game engines.
Con Discontinued as of July 2021, in favor of Construct 3
Construct 2 licenses cannot be bought anymore since July 2020, and support has ended on July 1st 2021 with the release of the final r280 version (see here). Existing customers can still use the game engine, but it will no longer be updated.
Con Clickteam Fusion Clone
This is a copy of the Clickteam softwares

Con Dependency on 3rd parties for all exports
Unless you are creating a game strictly for browser/HTML5 usage, exporting to desktop or mobile is risky, as Scirra have no control over your final export quality. Since desktop uses NodeWebkit and mobile is Crosswalk, Phonegap or CocoonJS there is no guarantee that your final export performance and quality will be up to scratch for pro level 2d games. These 3rd party "browser wrappers" are very prone to breaking and introducing lag and bugs that can't be controlled from Scirra's side.

Con HTML5 Only is extremely limiting
If the software could export natively to mobile devices and PC/Mac/Linux it would be extremely powerful. The developer's choice of sticking to only HTML5 has created a bottleneck for anyone wanting to develop with this software.
Con Tilemap object could be better
C2 requires that there's a tilemap objects for each tilemap layer meaning each tilemap object has to be updated when modifying any layer. This could be simplified by adding layer support for tilemap objects.
Con Buggy
Experience regular crashes and inexplicable project file corruption.
Con Unreliable access to online resources
Unreliable access to online resources such as online tutorials and forums, plus extremely outdated offline manual.
