One difference, due to the heavier construction, is that higher end units often have more payload capacity. Some of the lower end units have minimal payload, so very easy to max out the tires, frame, suspension. That contributes to tire issues, broken springs, frame cracking, etc.
We didn't care about the bling, but wanted a well-constructed unit. We ended up ordering an Arctic Fox fiver. Should take delivery early August. Like others have said: 12-inch frame, offroad suspension, solid wood cabinetry, porcelain toilet, 4-season insulation, full-size microwave. Only 29.5 feet, but grosses out at 13,400 lbs. 3750 lbs. payload capacity.