Maybe opinions differ. But this is what I know from experience and what I have heard in the past - going according to E90 of course.
My Continental Sport Contact 2 RFT's (225/45R17) were horrible in just about every sense! Road noise, tramlining, hard, less that ideal grip, just made the E90 feel unstable and unpleasant. In fact, I have them temporarily on the E46 and at open road speeds the car feels quite dangerous with its tendency to pull the car from side to side depending on road camber and surface change.
I was extremely sceptical of the Bridgestone Potenza RFT's and when I bought my style 188 narrow/wide wheels they came with these tyres. I just remember family of ours who had an E90 320i 2005 model complaining bitterly about them and how the car also suffered from tramlining. So I did not expect much when I fitted them on my car to test. Well, I was completely taken aback at how much better they were compared to the SC2 RFT's! The car felt lighter on its feet and handled a lot better overall, and virtually no tramlining! Grip is good, but I reckon not as good as a good set of non-RFT's. Noise is somewhat better, and ride is also a bit more bearable. Something to remember though is that the initial Potenza RE050 (full tyre model) was much improved with the RE050A, RE050A1 and RE050A2 models (the two last ones being much the same actually). Mine are the RE050A1 on the front and RE050A2 on the rear.
Quite a long time ago I spoke to a helpful chap at a tyre place and he explained to me why the Bridgestone Turanza RFT is known to be noisy (mostly from what I read on the E90Post forum at the time), that being the tread pattern. Other than that, cannot comment on these tyres.
Pirelli P-Zero RFT's are fantastic, would have loved to get them for my car, but at the time they were hellish expensive and there was a local shortage of them. I reckon they are still better than the Potenza RE050A's that I have.
To be honest, I am surprised that the Potenza S001 RFT is not so great from your experience, maybe just better suited to dry conditions. Truth be told, I am lately super cautious in the wet, so don't really put my tyres' grip to the test. But it's when you need to avoid an accident that good grip counts, so don't blame you for wanting to find a better tyre.