A lot of good "best features" discussed already.
I don't know that this is the best, but it's one I really appreciate, and that's the basement A/C-HeatPump. No roaring A/C's overhead, a single residential air filter that's quick and easy to change out, more efficient to run for whole-RV cooling and heating or just to run the fan to move air.
After having one in my 2001 Journey, then having two RV's in between without one and having to clean about 10 little foam discs in the air intakes on my Newmar, it's pure pleasure to have one again in my current Journey.