I have both and it sounds like you'd want a class C. In comparison, the cabover camper I have is WAY SMALLER and MUCH more cramped than the Class C! I didn't realize how much smaller it would feel like than the Class C (ours is 30').
Both fit easily into parks and campgrounds. Both drive easily.
I find the camper great for the very short, last-minute trips where I do more exploring and moving night-to-night around during the trip. The class C is better for longer trips and with less moving around. In the Class C, you tend to get stuff laying around everywhere that has to be secure before driving. But, it sure is nice for spreading out a lot more than the camper!
I'd suggest you rent a class C first. If you could rent a camper, do so too. The difference is immediately noticeable, but hard to describe!
Good luck!
Bill