I've had both, gas and diesel. Yes the diesel is quieter and rides a little bit better than my gas one did, but the only thing I got frustrated with the gas unit was that I couldn't get gasoline at the truck stop pumps. Seems new gas stations have the pumps situated where it is cumbersome to get in with a large gas motorhome, especially if towing also. So we tried to stick with Flying-J, but there are many areas where there is no F-J. My V10 acceleration on On-Ramps was much better than my Cat330 diesel. MPG on the V10 was around 7-8, on the Cat330 I get 6.5-7.5
I wouldn't hesitate going with a Gas, but just test drive it on bumpy and at highway speeds first.