class a or c

I have a 28' class c gulf stream, only had it 3 months, my wife
and I feel it's a bit confining - we have a chance to buy 2000
31' Fleetwood southwind - its like brand new, 15,000 miles, very
nice shape and the price will be reasonable - its gas powered
any thoughts on the pro's/con of diesel instead of gas ? - this
coach is like brand new ! help, I need advice, drivers/passenger seat
on our class c is tight, hard to get into the back area,doghouse
gets pretty warm on legs, too confining, have I already answered
my own question ? thanks