I'm in the planning stages of moving up to a class A someday and am in a similar decision process. The thing I'm really learning is that it all comes down to what you are going to tow (if anything) and where you are going to drive.
No towing and hanging out mainly in flat areas and a gasser would be fine. Hooking up a 4-5K# (or more) toad and rolling up the mountain passes you'll probably be disappointed.
Doing only one of those with the gasser would be somewhere in between. As in, no towing in the mountains or towing in the flats would probably be manageable.
Take me with a grain of salt though.... I've never driven a class A a foot but have towed a lot of trailers. I've just been reading A LOT on here of everyone else's experiences and opinions.