We recently purchased a class A, after going through some of the mental gymnastics you are now doing. We really wanted a C - smaller in size, more truck-like, easier to service. After looking for a few months, we inevitably purchased an A.
We are fulltiming and found the differences between a C and an A favored the A:
Cargo capacity - this was a huge factor. We didn't want anything with less than 3500 lbs. of capacity. We even found quite a few As with very low CC (one had 1200 lbs.) but as a whole, As carry more than Cs.
Cargo access: As have larger access spaces for larger cargo than most Cs. After having had a tt with small cargo doors where half the stuff had to be dragged out to get to what we needed, we wanted easy access in our outside bays.
Fresh Water Capacity: most As have larger fresh water tanks. We boondock and dry camp a lot. 35G was not going to cut it.
Fuel Capacity: As carry 70 gallons or more. Cs carry @ 50G or less. Stopping for fuel all the time is time consuming and stressful.
Front cab: In As, the front cab is part of the living space. In most Cs, you practically have to climb out. The space is more confining and a waste when one is parked.
Tow Capacity: Typically the tow capacities are 5Klbs. in an A, greater if one gets a diesel. Most Cs have 3500 lbs.
Good luck in your search!