Firemonkey vs UDK
When comparing Firemonkey vs UDK, the Slant community recommends UDK for most people. In the question“What are the best 3D game engines?” UDK is ranked 17th while Firemonkey is ranked 68th. 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
Ranked in these QuestionsQuestion Ranking
Pros
Pro Multi platform
It's available for Windows, OSX, iOS and Android.
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 Fairly new
It's about 2 years old, but still feels lacking compared to other engines. The main aim is desktop applications rather than high performance games.
Con Superseded by Unreal Engine 4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.