I'd probably say HRH since it's the closest to the parks. That way one spouse can take the kids to the parks while the other relaxes in the room. You can do that at the other hotels too, but with the HRH, it's only a 5 minute walk. You can still visit the other hotel pools and use them, but the kids will like the music and slide at the HRH.
If you book the HRH, be sure to check your reservation a couple months before you go, and then a week before to make sure it's still on file. For some reason, the HRH has a habit of losing reservations. And try to check in early. Even if your room is not ready, you still get your magic keys.