We've had excellent buying experience from Lazydays in Tampa and bought two coaches there so far and sent several others as well. All happy. The service experience has been more bumpy, not because they are bad, but because they are so huge that things tend to get lost in the shuffle or at such arm's length that the actual repair tech doesn't get your whole story. Never had a problem that management didn't straighten out right away when I told them about it, though, and I think that's a strong plus.
But if your measure of "best dealership" is simply who has the lowest prices or offers some particular brand/model, you might make a different choice.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL