First, define what you want the 9mm for. Different guns will be better suited to different tasks without taking into account different preferences in looks, feel, price, etc..
For Range, Target and general plinking. I happen to like Browning High Power
For Home defense I happen to like Ruger P-Series
For Concealed carry- I happen to like Kel-Tec
But I can't really afford Brownings, have a hard time concealing Rugers, and don't feel either a KelTec P11 or PF9 is ideal for a lot of range time/target work.
For carry a lot, shoot a little, the P11 is hard to beat although the PF9 is thinner and lighter. I've seldom had a misfire with any Ruger I own, their like Timex watches used to be (they just keep on ticking) but the Browning has an edge on accuracy.
And, that's just 9mm. Now, if you want to debate concealed carry of a .40 S&W or home defense in a .45ACP, the whole thread gets a lot longer.
Dan R