As a user of both products I can give you my opinion of the two: All versions of C4D below ver9 are IMHO the most stable applications (graphics or otherwise) ever designed. Version 9 apparently is a little buggy for some people with certain hardware. Carrara was built off of the old RayDream line. And it was well known as a crash test dummy's favorite ride. ;-) I used to beta test for them but I bailed out long ago. They might have finally gotten the thing to stop crashing by now. But I moved on to better apps. Last time I looked. Carrara didn't have nurbs abilities and C4d Does. But again that may not be the case anymore. I haven't looked at it for a long time. The Carrara Spline modeler is a nice tool. But it makes ugly triangle based meshes. I personally hate that but that's just me. C4D makes beautifully constructed meshes constructed of quads with it's HyperNurbs tool. -ScottA