As noted, for overall safety the Class C wins hands down{far better crash protection, multiple doors etc.}. They also are much easier/cheaper to service. C's tend to sleep more bodies. It all comes down to how and how many, are going to be using the coach.
Yes, I have a C but would not hesitate to move to an A if our needs changed {not likely}, but bang for the buck our C is the perfect fit. I've looked at several of the newer sub 30' A's and while they are OK they offer nothing I need and/or don't already have in our 24' C.
As always... opinions and YMMV.
:C