I haven't been inside the rooms at HRH or PBH, but I've visited both and stayed at RPH...and here are my thoughts...
Favorite: RPH
2nd Fave: HRH
3rd Fave: PBH
RPH is VERY beautiful. Yes, rooms are a bit tiny...but they are the same size as Disney's All-Star Music resort, and this is the (usually) least pricy hotel of the 3, so I have no right to complain. The employees are VERY VERY friendly. It has a nice, large pool and friendly atmosphere (my dad was impersonating Arnold from T2 and fellow employees cracked up...in a nice way. I, myself, found him acting like an idiot, but at least they were nice enough to laugh.
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HRH. The is HUGE. Couches, chairs everywhere! Very pretty as well. I LOVE the pool area. I could hear music when sitting on a lounge chair...and even when I'm underwater! Yes, the pool has underwater music. Awesome!! It has a wonderful waterslide that a bunch of kids, including me, love. It holds up to 300lbs so any adults interested...slide in!
The PBH by first glance was "Whoa" It's HUGE. And to top it off...rarely can I ever say "What a pretty elevator"...but at PBH I could. Being the most expensive and probsbly the most romantic hotel, I'd have to say this is my 3rd favorite. It's TOO big. It is like the size of a town! I nearly got lost there, which is not found. I found it difficult to navigate around the property. The main pool, with beautiful stone decor and two slides is nice, but it closed early (about 8PM) and I didn't get to jump in. I guess it's their lap pool that stays open until 11PM. Whoop-pee...not.