Moondocker - gotta say after reading lots of post on lots of sites -the first year of ownership for many coaches is a shake out and fix. This goes for most all motorhomes. With that said, we've had our share of issues - most ankle biters. The real difference that seems to matter is repairs on stuff as they need to be fixed under warranty.
From experience, Forest River (aka Georgetown) is tough to contact. By a twist of fate we wound up with the opportunity to buy a second new coach after only 6 months with our Georgetown.
Enter our Challenger 37TB. Do you spend time fixing the issues in the first year? Yep - fortunately we have a great service department at our dealer and Thor warranty has been great.
Now - features. That is where our Challenger shines brighter than any others on your list. Basement storage of 172 sq ft, great wheelbase ratio, 1.5 baths, well thought out inverter circuits, 80 gals grey water, 80 gals black water, 100 gals of fresh water, residential frig, king size bed, 5 TVs with HDMI, etc. We spent 2 months boon-docking in Key West this last winter. Running 2 loads of wash with the on board washer/dryer, normal shower everyday typical household chores and we emptied/filled up once every 5 days.
Would I buy the Thor again - you bet.
Gotta say- the Newmar coach is nice but when you look to boon-dock as long as we did, the DW simply wouldn't have it any other way than once in 5 days.
Hope this helps.