The two you mentioned aren't that different in quality, especially after a couple years use as to matter. More important is to look for maintenance and signs of heavy use, both mileage and wear. Water intrusion and the subsequent damage are the biggest concerns.
As to the Generator, all newer units have generators with a remote start capability, usually both on the van dash and in the coach. They are not normally set up to "automatically" start when outside power is off or it would be trying to run every time you were storing or driving it.