PCR, compact,P-o1 basically the same weapon, steel frame, alloy frame so a weight difference.
of course you got the de-cocker/ safety thing going on and the rail but size wise its a wash out.
I have the p-01 simply due to the fact that I found one before I found a PCR, had I found a PCR first then I would be carrying that.
the rail doesn't matter to me one way or the other as the only purpose it serves for me is possibly opening a Beer while in the field.
I figure with the de-cocker, firing pin block, DA trigger pull to carry anyway other than hot chamber is a bad idea, but hey that's me.
I don't think that you can go wrong with the PCR, P-01 or Compact 75 .