I have been talking to different dealers about motorhomes lately as MDW and I are considering upgrading from a TT. When ask about how they ride and how they drive (class A VS Class C)it all depends ...
To answer your specific question with generalizations:
MOST of the time, the Class A will drive better than the class C of the same era. This is especially true post 1999 or so when the Class As went to a wider track on all chassis.
Obviously there will be exceptions here and there in both directions but that is generally how it is.