But it is an advantage of an engine, if there is a big and active community as well as many ressources, wdlmaser.
-Comunity
-Shaders! (I seriously didn´t get to know anything comparable yet, the Unity System is okay, but there is no realtime preview which is comparable to the gamestudio one and the price for render to texture, which is an important feature for many shader effects is much higher and ShiVa doesn´t even seem allow custom shaders)
-vec_ functions
-manual
-stability
-c_move
-speed if you know how to do things correctly
-flexibility
-...