Of the big CG packages, I've used both 3DS Max, Maya, and Blender--Max most of all. The gold standard for UI for me, though, is still Wings3D (based on Nendo).

Of the big CG packages, I've used both 3DS Max, Maya, and Blender--Max most of all. The gold standard for UI for me, though, is still Wings3D (based on Nendo). It has way better UV unwrapping support than anything else I've tried. It is as good as it is specifically because the functionality it aims at is quite limited. Sketchup gets an honorable mention for UI, but the scripting and geometry it makes is such garbage I can't recommend it.