No point in hiding the fact that glocks KB. They do. All guns do. There are just alot more glocks and that is alot more chances for failure.
On 9mm- I shoot it because it is the smallest round I can compete with (probobly for good reason) and I get the most bangs for my buck. In a situation where I picture using my pistol, mag capacity is HUGE to me.
Assuming worst case scenario...
I am vision impaired, attacker may be armored, multiple attackers, need to flee a good long distance...
All of these cases have better odds of landing shots with more shots fired.
Also- more shots fired can equal more time to run away.
Some of us have dilusions of being some sort of calm badass in a gunfight.
I like to think about what would help the most in a situation where I really really sucked
I picture myself being sedated/drunk and clumsy and with mace in my eyes.
Do I want 7 chances to 'put them down'
Or do I want 17 chances to hit something, keep heads down, and put distance between myself and the attacker/s?