Go and see as many units as you can. Then go see a few more.
If you are only interested in brand new then the Hershey Show in September usually has a good selection of Class B's on display.
Don't be mislead by newly purchased unit owner reviews. At the very least try to follow up on those to see if they still even own the unit after a few months or would still recommend it after using it for several trips.
I'd say take your time and decide for yourself what is better
. Seems like everything can be better based on the point of view; more efficient, less expensive, more comfortable, easier to maintain, more convenient etc.