From diesel to gas.

We went from a small Class C gasser to a DP to a Class A gasser and then to another Class A gasser. We loved the ride in the DP, but hated the floor plan and maintenance costs. We love the floor plan in both our current and former gassers, and since like most RV'ers, we spend far more time living in it than driving it, the ride and noise level doesn't bother us enough to consider another DP.

I went from a diesel 3/4 ton tv to a 1 ton v10 gasser and regretted it big time! Not much later went back to diesel.

Recent similar discussion here.

We went from gas to diesel and then to diesel. Definitely no regret!