Pool shouldn't factor into it, since hopping around is totally encouraged!
HRH: pool slide. no proper swimming as everywhere away from the slide's immediate vicinity is too shallow.
RPR: can do a bit of swimming here, it's a BIG pool, and there's a water play area. when we were there they had a volleyball net over one part of the pool, with balls to play with, and people were having lots of fun with that.
PBH: main pool, a tiny bit of swimming, wading in the shallow water with the sand bottom, pool slide.
PBH: quiet pool, SWIMMING. nice, big rectangle of a pool. Also, hot tub and what seemed to be a cold tub (plunge pool) right next to it. Or maybe it was a nonfunctioning hot tub, LOL. we used it as a plunge pool though!
My 8 year old loooooves PBH. It has the biggest rooms and he loves playing on the bolted-to-the-ground vespa-type scooters they have there. Not sure if he'll still do that at 9 or 10.
At the time (age 7) he loved RPR rooms and grounds. But they have the smallest rooms.