Spring RTS Engine

im gonna jump in here and say that SketchUp has the best UI of any 3d program i have used ( I've used a fair amount). It may not necessarily be the best for spring, but it is the easiest to use (and i don't use it cause im lazy, i use it because i like it

i will conditionally agree there clumsy, there are bits i like and bits i prefer wings for.

wings however is free. a usable copy of SketchUp costs $495USD unless you steal it. (there is a free version, but its worthless because you cant export.)