Just passed our first year of ownership with our Class A gas motorhome. We have a Miramar 35.3. For us it came down to how we would be using the RV and of course cost. My wife and I both work 50+ hours a week and are basically weekend warriors. We take a week long trip once or twice a year but mostly a once a month weekend get away. When looking at floor plans we liked, it would have cost us minimum $50,000-$75,000 more to get a diesel with the similar features that we wanted. It just wasn't worth it to us.
In reading the forums for several years, you would think that all Class A gas motorhomes drive like **** and the entire time you are driving is a white knuckle event. I had read all of these horror stories and I was a little apprehensive the first time I drove our new Class A gas. I had never driven a motor home before. After a year of ownership, I can say I am very happy with the ride of our Miramar. Yes, the first couple of times I drove it I had to get used to the driving characteristics but I am used to it now. Before I purchased it, I had planned to save some money and get some suspension mods done but now that I have owned it a year, I don't think that it is necessary. I hear about semi trucks blowing you sideways but they barely push our Miramar. Most of the time I hardly notice them. I don't think all Class A's drive alike so my above comments don't apply to all Class A's. I am sure some Class A's might require some suspension mods to make the driver happy. I am sure that a diesel pusher will most likely drive nicer than my gas but it just wasn't worth the cost for us. If we lived out west and drove in the mountains a lot I probably would have seriously considered a diesel pusher. We live in Florida so it's not an issue for us. We are parked in the motorhome for way more time than we are in it driving it.
Burch