I have a 75B & a P-01. Both of them are great pistols, both are
very similar. As has been said many times in this thread, the P-01 is easier to conceal, and lighter on your hip. It's a wonderful piece and rides nicely in a Galco OWB under a light shirt or jacket.
On my 75B, the trigger has broken in a
lot more nicely than on the P-01. I probably have > 500 rounds through the P-01, so my hopes aren't very high for it to work in as smoothly as the 75B has. But ... it might. I've had the 75B much longer, and it's had multiple thousands of rounds thorough it, both in 9mm, and in 22 with the Kadet kit.
Both guns are far, far more accurate than I am. That said, in the hands of a very competant shooter, possibly shooting from the bench, I'd say the 75B is a tot more accurate. If I had to get rid of one, it would probably be the P-01. But - I've a sentimental attachment to that pistol that may be (seriously) clouding my judgement. If that attachment weren't there, I'd probably have a lot more trouble deciding between the two.
I suppose if it were to be solely a range gun, I'd go with the 75B. If I were planning on carrying it concealed, or even in the open, the P-01 would get the nod thanks to the lighter weight and the smaller size. If I were doing it over, I'd probably get the PCR though - I've zero need for the rail.
And personally, I think they both look pretty cool:
Edit: To point out that both pistols have been stone cold reliable with anything I've 'fed' them.