I've stayed at all 3. When it comes to PBH, I'm in the minority because I was not all that impressed.
I think PBH is stunning - for the 30 seconds each day that you are inside looking out on the bay area. When I was walking toward the lobby and looking out the window each morning, the view was amazing from the window. But I felt that when I was actually outside, it was no big deal. And most of the time when I was inside, I didn't have that view. The hotel has a reputation of being really beautiful, but I never felt it other than those 30 seconds a day when I was looking out the window.
I thought it was nicer than the Hard Rock, but you can't beat the location of the Hard Rock. In the summertime, I found that the walk to the parks from PBH and RPR was overwhelming in the heat.
If I were going back, my first choice would be HRH because of the convenient location. If I had to choose between PBH and RPR, I would not pay more to stay at PBH if RPR were cheaper.
I stayed Club Level at PBH and RPR. At RPR, I was on the same floor as the Club Lounge (although that is not always the case). I really liked that for convenience and a sense of privacy/exclusivity. At PBH, the Club Lounge is on the first floor, and your room will not be on that floor. I did not like that.