My last four RVs were all Class Bs - TransVan, two Chinooks and one Roadtrek. I liked the size, handling/drivability and MPG that I got on all of them. My camping style at the time was to use the RV as a home base for hiking and off-roading activities. So all I needed was a dry place to sleep, place to get cleaned up and a place to cook up a hot dog or two, and the Class B was perfect for that. I used to say that when I moved out of tents I just moved up to a fiberglass tent that required no more than setting the parking brake to complete my camp setup. And the best part was there was cold beer in the fridge.
However my Class B days are over at this point as I've moved up to a small Class C, or what some might call a B+. It has a bit more room for sleeping and more places to carry ****. Spending more time now RVing and I felt I needed a bit more room, although to be perfectly honest I could have managed quite well in any of my previous Class B's.