I'd just buy the P9, the extra, .4" inch of barrel doesn't make as much difference as the ammo you run. Or get the ported barrel for it, you gain the barrel length back, plus have porting to help with muzzle flip. I bought a ported barrel for my CW40, It does help. You lose the polygonal rifling, but gain the ability to shoot lead bullets, which you are not supposed to use in the polygonal rifled barrels, although I'm sure people do it. All the models warn about shooting lead bullets.
A few years back, a friend of mine loaded up some lead RN 9mm cartridges, and we put about half a dozen thru an original Italian Beretta M92 (before the military adopted it), and a Star Model 30. Groups tightened up noticeably with jacketed bullets after running the lead bullets thru the guns. My friend said that his Uncle told him about that trick. I'm not sure what it did physically to the barrel, other than leave a little lead in it, but it sure made a difference.
Tom
Live today, tomorrow may not come!
Boberg XR9S
Kahr CW40
Springfield Armory 1911
Dan Wesson Revolver
HY*NDAI is to cars, what Caracal, Hi-Point, and Jennings is to handguns. The cars may or may not run ok, but the corporation SUCKS.