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CryTek3 simply is better
Cry Engine 3 is pretty advanced in terms of tools compared to earlier versions and likewise idtech5 has a pretty advanced development suite these days.
Quite like the real time cave building as shown here: http://www.youtube.com/watch?v=d-7ME7rkAkQ#t=2m16s![]()
Not sure where your getting "Last I checked ID tech required the artists to have a postgraduate degree in mathematics to use" from, I've done development on projects using id engines from quake 2 onwards and if not the most professional pipeline its fairly simple, personally I'd take the original incarnations of radiant over unrealed any day.