When comparing RPGMaker vs UDK, the Slant community recommends RPGMaker for most people. In the question“What are the best 2D game engines?” RPGMaker is ranked 28th while UDK is ranked 73rd. The most important reason people chose RPGMaker is:
It's possible to create a game with absolutely no art or coding skills, so even complete beginners can make something.
Specs
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Pros
Pro Easy to jump into using an intuitive WYSIWYG editor
It's possible to create a game with absolutely no art or coding skills, so even complete beginners can make something.
Pro Large and active community
The engine has seen multiple iterations since 1995, so a large online community exists that is always willing to help each other out.
Pro Ruby / Javascript support provides depth to more experienced developers
With a script editor that uses a modified version of Ruby, it's possible to go well beyond the traditional RPG with this engine. Note: XP and VX use Ruby, the latest version "MV" uses Javascript for scripting.
Pro It's an open engine
It's possible to use custom editors from the community, edit libraries,include libraries,etc (MV Only)
Pro Multi-platform
MV supports HTML5 exports, so it is easier than ever to make your game work on iOS, android, OSX,Linux or Windows.
Pro Inbuilt database and multplayer plugins, providing you the scalfolding to customising your projects with ease
The inbuilt database which binds to game saves or can be made persist allows great power within your logic. Also a plugin called 'Alpha.net' provides multiplayer. This combination can allow great customisation of the engine, allowing a powerful 2D game to be made with little to no coding experience.
Pro Greater Map layers
MV Mapping uses an additional layer to create better depth.
Pro MV has HTML5 export
You can now HTML5 export your projects, so you could theoretically host your game on your webserver, and have your friends play the game without ever having to install a single thing.
Pro A cheap license that allows using the software commercially
There are several versions of RPG maker, with MV being the latest and most fully featured: MV ($79.99), VX Ace ($69.99), VX ($59.99) and XP ($24.99), 2003 ($19.99).
Pro Large toolset
UDK has an extremely large toolset that allows creating almost anything without having to use a 3rd party tool or plugin.
Pro Triple A track record
UDK is an engine used by many big name companies for popular games such as the Gears of War series.
Cons
Con You have to code when you want something didn't built in
You know,RM series' default walk animation only has three frames.If you want to enhance,you have to code by yourself——especially majority of it's user are newbies.
Con No Hardware accelerate
You'll get a bad performance when you have big animations,especially in MV,which can easily change into higher resolution.
Con No 3D support
None of them have 3D support, it is possible only with manual scripting which could be difficult for beginners.
Con MV Does not have a "REAL" Android export.
MV has an export to HTML5 - which can run on any browser including android. It is however not a "native" app export.
Con Inconsistent included visual assets
Included visual assets within MV have inconsistent presentation. Though RPMMV does contain enough to make a small basic title, the visual assets don't often look like they should be mixed on-screen.
Con No built-in realtime battle system
RPG Maker series has only turn based battle systems, unless scripts/Plugins made by the community are used.
Con Conversion to MV difficult
Older iterations of RPG Maker use smaller sprite sizes that require manual conversion to use older RTP assets and older assets are more robust.
Con Superseded by Unreal Engine 4
Con DevKit only runs on Windows
Even though UDK can deploy games to run on multiple platforms, including Mac, it does not feature support for development on Mac.
Con Limits games to FPS
UDK was originally developed for the FPS, "Unreal Tournament", and it certainly shows. While UDK is a very powerful engine, it takes quite a bit of work to make it do something other than an FPS.