Hi Stefan, cars are kind of a difficult model to work with anywhere. They are also difficult to do in NURBS because they have a lot of swoopy curved surfaces that usually need to be modeled in NURBS as extended patches that are then trimmed. That's in general a more finicky and advanced type of surface modeling.

The key area where NURBS modeling is way way easier than sub-d modeling is when your shapes can be well defined by 2D profile curves and boolean operations. That is not usually a fit with a car though.

It's a type of model that I think can be easier to do in sub-d because you don't have to worry so much about extended surface shapes.

- Michael