I have only stayed at POR so perhaps my point of view will be limited, but I can't imagine staying at the others.
Coronado has too many conventioneers ( I work at a hotel that hosts a lot of conventions and the last thing I need is to be on vacation at a convention hotel) and Caribbean Beach is showing its age and is too spread out.
I did visit POFQ while staying at POR and I do find POFQ to be smaller therefore might be more intimate. But there is something about POR at night that makes it so enchanting. Listening to Bob Jackson at the piano bar at night, walking along the mansions and through the bayou at night and all of the quiet pools.