We have been in a gas Class A for 6 years of traveling; living 1/2 of that time in the motorhome. For us, and many, the primary concern is comfort in the living mode. Floor plan that fits your needs and wants is most important.
Yup, the gasser is noisier up front. Handling is generally better in the DP, but not always. Most gassers handling can be improved to satify the driver/occupants.
I think the gas/diesel thing is about "want" no so much need. Depends on how much travleing (miles) you intend to do. There is lots of information out there on this gas vs. diesel discussion.
We started in a 32 ft. Winnebago and are now in a 38 ft.Tiffin Open Road. Very happy with the floor plan and comfort level.