We have a 2010 40G and really enjoy it. With 3 kids we looked at everything with bunks, which was only 5 models at the time. I can't remember the difference in each coach that pushed us to the Discovery, but remember there were a lot of little things. Over all we liked the layout better especially in the main area. We liked the U shaped table. In some of the coaches the bunks weren't accessible with the slides in. In others the TV in the main area was covered I with the slides in. It's hard for the kids to watch TV when we're driving if it's behind a wall.
The closest dealer to me is almost 300 miles, so I repair as much as I can myself. As Blaster Man says, Fleetwood customer service is fantastic. I call them several times a yr with a questions. They're always quick with an answer or an email with a schematic. Spartan Chassis customer service is the same.
The one thing that frustrates me on the Discovery (maybe it's changed, I doubt it) are the plastic pieces. There's 10 or so of them in the coach. They keep the closet doors closed, sliding bathroom doors from swinging, etc. They constantly break. When one breaks I buy 5. I'm guessing there in all the coaches, but would look.
We're not in the market for our next coach so I can't compare what's out there today. If we were, I'd look at everything, but certainly buy another Fleetwood with no hesitation.