IMHO Lightwave is the best.
Cinema4D is however fast, amiga-conform and stable too-
I would not recommend T3D att all. As Lempkee wrothe, its very unstable.
PPCRulez:
Do you have any "rules" how to work with T3D without rebooting every few seconds?
Wich version do you use, wich Amiga do you have exactly?