If you like driving a truck, get a Seneca. Engine is up in front of you.
Were it me, and I had a "do over" I would get a class "A" gas, and particularly one the had a small dog house and swiveling seats, as you get MUCH more living space.
No matter what you look at, be sure and drive it for quite a distance AT HIGHWAY SPEEDS to see if you can live with the wind noise.
If the seller just wants to go around the block, run away fast.
I cannot afford a diesel pusher, and I don't know how to work on them myself, so I am looking to convert from a Jayco Seneca 33ss to a class "A" myself. This after spending $400.00 for a complete cab install of "Killmat" sound deadener. And it is still too noisy for me.
Just my opinion.
Mike in Colorado