we have a Class A and HAD a Class C.
My experience with grandkids, is that we had more room for them to sleep in our C. The table folded down, so one slept there. We had the "over the cab" part for my 2 grown kids to sleep. Then, there was the couch that came out.
The A has the couch that folds down. And, our bed in back. that's it.
So, we have a lot more space, but less sleeping area for guests :)
will be fun to see what you buy!
eta: that being said, I wouldn't go back to a C or a 5th Wheel. I love my motorhome :B