There are a lot of things to consider. Gas or Diesel. Gas is cheaper to purchase, cheaper to maintain. However they don't handle as well, with the v10 they tend to scream going up hills as they drop to a lower gear with higher rpms. They are limited to size and carrying capacity.
Each have a place. First you need to figure out how you will use it, whats important.
We just traded in our gas A jayco today for an entry level older diesel pusher. However as much as we would love a Tiffin, Newmar, or Winnebago we only use it 45 or so days a year. We use it week ends only to state parks in a state where there are no mountains. We are not interested in an expensive depreciating asset sitting 3/4 of the time.
Also I drive buses and have noticed that the diesels from 2008 to about 2013 in our fleet have a ton of problems with head gaskets, injectors, DEF sensors pumps, etc. Granted these buses idle a lot, are driven with lots of stop and go and short trips. But I don't have a personal mechanic. So for us we opted for an older under powered (trusty Cummins 5.9) diesel pusher with upgraded interior.
So figure out your price point, how you will use it and whats important to you. Enjoy the hunt.