I like the Class A only resorts mainly because they are so quiet compared to those that cater to all types of RV's. What I really like is there are pretty much zero diesel pickup trucks running around the park, they are so loud and smell terrible. There are the occasional DP class A units firing up but not all day long. These parks, at least the ones we stayed at, are well maintained and you don't have anyone burning firewood a couple feet from your awning. I have stayed at more regular campgrounds than Class A only but those are what I prefer.
Nick