I'm with the others on the fiberglass roofs. You can also get a coating for the rubber roofs that resembles the bedliner for pickups. We put that on our older used mh (before we bought the current one) and 7 years later the guy who bought it said there's still no leaks. Now we own a
Phoenix Cruiser 2551 with a fiberglass roof and we love it.
I get the idea you're buying new instead of used so you do have more wiggle room on the layout priorities.
One thing I'd suggest is to do an honest appraisal of the closet space on each. The more closet space, the more clothing you can take on a trip. It helps when you want to spend your time sightseeing instead of in the campground laundromat.
Personally I prefer the Chevy chassis. We bought a Vespa for our get-about vehicle and love it especially for going into towns that might have limited parking. You might want to consider something like that instead of the expense of a towable and it's connectors.