RVPRs is the first stop for me also. Everyone has a different way of rating. Some will give a low rating just because the office staff was grumpy or they were expecting a 4 star CG at a 2 star price. I start at a 10 & deduct 1 point per negative item starting with value for money. Ignore the top review. Ignore the bottom review. Pay attention to those who have made many submissions in many states.
Allstays has many more CGs listed but not many reviews unless linked to RVPRs. RVPRs is missing many county parks & town parks which I find to be pretty good for the money most of the time.