1. The HRH rooms are a little larger than those at RPR. The RPR does have the sink outside the bathroom, while the HRH has it inside the bathroom.
2. Location- I think the HRH is a little closer to the park- maybe someone has measured the difference, but I would say the difference is not that great at all.
3. Pool- both have zero entry, but HRH has an awesome slide, while the RPR doesn't have any.
4. Music- which plays all day long- Rock at HRH and 30's at RPR.
I would say if you want to be immersed in a certain ambience- then that could be your deciding factor. Also, in my opinion- the staff was nicer at RPR.