When comparing UDK vs NeoAxis Engine, the Slant community recommends UDK for most people. In the question“What are the best 3D game engines?” UDK is ranked 17th while NeoAxis Engine is ranked 32nd. The most important reason people chose UDK is:
UDK has an extremely large toolset that allows creating almost anything without having to use a 3rd party tool or plugin.
Specs
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Pros
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.
Pro Royalty free
You can use the engine for any commercial products and keep all the profits since NeoAxis does not ask for any royalties.
Pro Completely free
Pro Simple interface
You can learn how to use Neoaxis in a few days.
Pro Excellent visual tools, map editor and resource editor
You can easily create maps/scenes and add custom objects with physics and animations in a few minutes.
Pro Lot of maps and game-modes already built-in
Has about 30 built-in maps with different game modes which can be opened by the map editor and their source code can be edited.
Pro Good IDE support
Supports Visual Studio, SharpDevelop or MonoDevelop.
Cons
Con Superseded by Unreal Engine 4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.
Con The developers do not actively communicate with the community
Not only have the developers driven the community away, they have actively closed the forum.
News articles have not had any changes since 2016, and the last news article still has links to the now removed forum.
Con Windows-only
NeoAxis Engine is Windows-only.
Con No community
As of 2016, the creator has completely destroyed his own community in order to silence any criticism from developers.
Con Lack of tutorials
Unfortunately, the wiki doesn't contain many programming tutorials, and the source code itself isn't very self-documented. Creating new gamemodes or AI will require lot of research for beginners.