I'll stick my nose in . . . since you asked for opinions . . .
First off, I have owned and shot at one time or another each of the following 9mm's -
Browning, S&W, Colt, Glock, Beretta, H&K, Sig Sauer, Ruger, CZ, Taurus, Tokarev, and probably a few more clones that do not immediately spring to mind . . .
My pick - hands down, the Browning Hi Power. Most of those listed above have some attributes that recommend them, some more than others. You asked for opinions and mine is that the Browning comes as close to perfection in my book for a 9mm as you can get. I've always loved the 1911 platform and the way it handles the 9mm with ease would be my close second preference; the Browning is just a bit more streamlined to me and no doubt iconic.