HK, Sig, Glock, they'll all serve you just fine. If you get a problem one, it'll turn up pretty quick. I personally use a PM9 for portability reasons and a P226 or 12ga pump for bump in the night depending on where I am.
WTF? More mass would mean less muzzle flip. The USP is polymer, like the glock whereas the Sigs with their alloys are beefier (aside from their pro and 250 series). Are you talking about bore axis/balance? If so, its all up to the shooter to see what he likes.
Regarding M&P's, yes, they have their problems but they're also fine pistols. I had an M&P 9 but ended up trading it for a Sig trailside .22lr target model. I didn't have any of the problems but if you frequent mp-pistol forums, you can lean more about the problems. The biggest one would be the magazine drop and some smaller ones like how some pistols like to eject casings back into your forehead and some have slide lockback problems.
I know the "torture tests" are ridiculous but I saw a Glock 17 vs. USP test, the Glock passed every test, the USP failed on the first one. On top of that too much of the mass is in the slide (same with Sigs), in rapid fire you'll have more muzzle flip than with a lower/flatter slide.
WTF? More mass would mean less muzzle flip. The USP is polymer, like the glock whereas the Sigs with their alloys are beefier (aside from their pro and 250 series). Are you talking about bore axis/balance? If so, its all up to the shooter to see what he likes.
Regarding M&P's, yes, they have their problems but they're also fine pistols. I had an M&P 9 but ended up trading it for a Sig trailside .22lr target model. I didn't have any of the problems but if you frequent mp-pistol forums, you can lean more about the problems. The biggest one would be the magazine drop and some smaller ones like how some pistols like to eject casings back into your forehead and some have slide lockback problems.