Class B vs Class C

[Engineer]

I am sure this has been discussed on here before. I did a search and found some information, but that I would ask again. Trying to decided between a small class C and a Class B. I am a solo traveler. I teach disabled veterans to scuba dive for therapy. It is nice to be able to be on the go. If I wake up and dive conditions in one spot are not good I want to be able to pick up and move an hour or two down the road. When I tired that with my Class A I found it almost impossible to do. Some places where I dive do not have RV parks, and parking can be difficult to find even for a car. So, I thought about a small class C. However, the class B is so much more maneuverable and easier to park. The class C has so much more room, which I could use, but don't need. When I am not diving I plan to drive around the country for photography. Both RV's cost about the same. Any suggestions would be appreciated. Thanks!