When comparing GLBasic vs Adventure Game Studio, the Slant community recommends Adventure Game Studio for most people. In the question“What are the best 2D game engines?” Adventure Game Studio is ranked 23rd while GLBasic is ranked 76th. The most important reason people chose Adventure Game Studio is:
Good for newbie game creators. Can be used for prototyping: on several occasions was used to make a demo/experimental version before creating a final commercial product on different engine.
Specs
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Pros
Pro Easy to develop with
Language is easy to use, with a fast compiler.
Pro Fast 2D
Pro Easy to learn
Pro Support
Forum support is great. No advertising in program or forums. Company has been going for over 10 years.
Pro 3D
Unlike most multi-platform development systems, 3D is available across most of them.
Pro Multi-platform
Code can be written once and will work on supported platforms with very little modification.
Pro No hidden fees
PC version is free.
Full Multi-platform version requires one-off very reasonable price, and all further updates are free, however you can run a watermarked demo on your chosen platform with the free demo version.
Pro C/C++ support
C/C++ code can be included inline or as a DLL/.o/dylib file.
Pro HTML 5 compiling is now faster and works better
Pro Default GUI system works fine, and has all the needed widgets needed
Only problem is position is based on position of previous widget.
Pro Compiler is fast and produces efficient code
Pro Free for home development
Create apps for non commercial 2D programs running on Windows, Linux and Mac OSX. The extension to create programs for other platforms, 3D or network applications requires a license key. Otherwise the "Premium" programs are limited to 10 min runtime for test purposes. There is no trial limit for the development environment.
Pro Networking
Easy-to-use networking system with either TCP or UDP.
Pro Books
Programmers reference guide, user guide and various others are free.

Pro Gaming related functions
Viewports, sprites, rotating/animating and zooming sprites, collision detection and pathfinding.
Pro Easy to learn tool
Good for newbie game creators. Can be used for prototyping: on several occasions was used to make a demo/experimental version before creating a final commercial product on different engine.
Pro Completely free and open source
AGS is licensed under Artistic License 2.0 and is completely free for use for creating both freeware and commercial games.
Pro Relatively well documented
Besides the manual there are multiple text and video tutorials and code samples written by community.
Pro Used for a number of high-profile commercial releases
Adventure Game Studio has been used to develop games such as "Resonance", "Blackwell" series, "Gemini Rue", "Primordia".
Pro Lots of assets available
An extensive library of game templates and script modules accumulated over years. You can construct a simple game in hours (if you know what you are doing).
Pro Friendly community
An old, big and active community which would support newcomers not only in learning basics of the engine, but can help with every aspect of game making (including art, voice acting, moral support, etc).
Cons
Con Command set has hardly changed or been updated/improved over the years
Con Poor 2d collision detection with rotated sprites
2d sprite rotation with collision detection isn't present and requires some annoying run-arounds to achieve what is a staple of other game engines.
Con No multi-platform editor
Whilst Linux and Mac IDE's were started, they were never completed.
Con No clear way to monetize apps
It's impossible to place ads. There is a third party in-app purchase library hidden somewhere deep within the forums which hasn't been updated for years.
Con Issues don't get fixed
The Blender exporter and the 3D converter have been broken and remain unfixed for years.
Con Only supports .ddd 3D format
This format does not support bones and only keyframe animation. 3d files will become extremely large if there are animations in models.
Con HTML 5
HTML 5 compiling is rather slow, and doesn't allow all GLBasic features
Con Poor GUI creation library
Its library for GUI creation is abysmal and not acceptable.
Con Poor documentation
There is next to no documentation on using OpenGL commands in GLBasic.
Con Natively supports only 2D
2D only native support, 3D could be supported with plugins though.
Con Uses dated tech
Engine is based on the old technologies, which impose number of limitations and may cause problems on latest systems (level of annoyance varies depending on your priorities).
Con Graphics renderer is a bit dated
Graphics renderer is not well optimized for high-resolution games and complex effects.
Con No visual editor for scripts
You have to actually write all scripts yourself.
Con Development is slow
Further development of the engine is currently slow, done by only few people in their free time.
Con AGS Script isn't as full-featured as other scripting languages
Its own scripting language has lower syntax capabilities compared to modern script languages.
Con Assets cover almost exclusively adventure/quest genre
The features, script functions and game templates are very biased towards adventure/quest genre. The non-adventure games were made in AGS (2D shooters, platformers, turn-based strategies), but their development usually requires to write everything from scratch.
Con Workflow is closely coupled with the editor
Workflow is very tied to the editor and custom file formats, which can cause problems for bigger, more professional projects (interfering with source control, parallel development, automated builds, etc)
