You can yet modelise with Carrara but it's not a very easy way because his learning curve way for modeling is some long :)
but for rendering it is one of the more easy and efficient (if a renderer can be easy :)
About moi, it's a nurbs modeler so very precise for all subject who is not especially "organic" like a monster but you can with make all very smoothing forms :)
Perfect for the rest : design, architecture, mechanic etc...