The couch is likely not as comfortable as the overhead bunk to sleep on. A dinette might be a bit better; many RV couches are not very comfortable at all to sleep on. (Mine is also not good for me because I'm about a half a foot or a foot longer than it is.)
While the driving sensation is somewhat different, I don't think there's a great deal of difference in how hard it is to drive a class A vs. a class C. If anything, some class A's are probably easier to drive, in as much as they are more maneuverable and have a broader view out the windshield. Poorly set up class C's with insufficient weight on the steer axle can have rather noticeable handling problems, and this seems to be less common with class A's. Of course, for any given specific motorhomes, it could go either way based on the specifics.
Class A's typically have a tighter turning radius (well, a less terrible one) than similarly sized class C's. Often they do have a higher cargo carrying capacity, or at least a higher gross weight limit, though sometimes the dry vehicle weight is also heavier in proportion. The lack of a cabover bunk is somewhat of a mixed bag in your case; it limits sleeping possibilities, but it also eliminates what is not infrequently a troublesome area for leaks and general maintenance. Very generally speaking, more class A's are set up with the idea of being used by a couple camping rather than a family, while more class C's are set up for family camping.
The cab area of a class C is generally a little more crashworthy than the cab area of a class A. The rest of the unit is not very crashworthy in either case. In the event of a serious crash, I would rather be in most any vehicle besides a motorhome (excepting a motorcycle). Given the choice, of course, I would prefer not to be in a serious crash in the first place.