The RPR is the fan favorite on these boards.
The HRH is in demand with the convention and rock/movie star crowd.
Many people report their reservation disappears (happened to me), their room isn't ready until 6pm, the carpet is a mess, and the room smells. This happens because people who stay at the HRH seem to have the rock star attitude of trashing their room, and house cleaning only has a few hours to get it ready for the next group.
These problems don't happen at the RPR. If you show up at 8am, your room might be ready. The rooms/hallway carpet is clean.
Yes, the walk from the HRH is shorter, about 5 minutes versus 7 for the RPR.
The pool at the HRH has the slide and underwater music. They have nerf footballs that everyone throws around the pool. The RPR has 2 basketball hoops and a volley ball net.
If you stay at the HRH, be prepared for a more "hip" kind of place, ignore the carpet in the hallway, and don't expect your room until 6pm. If all these things don't happen, then great, you got lucky.