We looked at class C's before purchasing our first Class A. At the time we had a 26' TT and thought moving to a 35" class C Diesel would be perfect. Nope, didn't work our that way.
The area over the cab was useless to use.
The interior quality was almost the same as the TT.
When we subtracted the over cab and driving area space we were left with no more room than our TT.
Ride and noise were OK but nothing to get exited about...kinda like driving the pickup. OK on the flats but really loud on hills.
Now that was just our opinion but going to a very nice 40' class A gave us everything we could have wanted for our 5 month summer trips. If our lifestyle was different, perhaps we would reconsider but for now it's DP all the way.