Class A's are worth more in the same year model and length, IMO.
C's look like an afterthought and there's just no way we would ever consider one.
A's have much better basement storage.
If you're going to see American and beyond, then it should be out of the largest windshield possible.
With either, you're correct about being able to just pull out and leave, whenever the need, but this only applies to Wally World sites and Rest Areas of some sort, where you're not hooked up to anything.
Again though, it's better with an A and especially with the jacks down and slides out. We can start up and even set the alarm off if need be, while preparing to get underway, from the inside.