RPR rooms are a little smaller. The beds are queen in both. The bathrooms are about the same. The pool at HRH has a neat slide and no water play area. Both have public grassy areas and the parking is about the same.
The atmospheres are completely different, as you would expect.
RPR is newer and the carpets in the rooms are in better conditions.
HRH has an ice cream parlor/Starbucks on the first floor that is expensive but good.