Keep in mind that Universal on-sites allow pool hopping. My kids like the pool at HRH best for overall atmosphere and fun. They have a slide that is longer but not faster than PBH.
definitely pool hop, it's easy to do and they encourage it. RPR doesn't have a slide just a water boat more for little ones. i agree that your 11 year old will probably like the ambiance of HRH better. i prefer the pools at PBH as there are a few of them and the main pool is large and has deeper sections. my kids liked the slide there better but HRH in general more.