There is no doubt that from a ballistics perspective the .45 is better, however, it still all comes down to the shooter. Get the gun you are comfortable with and become proficient. Get a lot of range time.
I often carry a Walther PPK which is even smaller of a caliber, a .380 but after thousands of rounds on the range, I think I would line myself up against any gang banger cocking a .45 or 9mm sideways and not worry ballistics tests. (not to say I don’t also have 9mm’s (CZ75s & Walther P99) and .45s(Dan Wesson CZ 1911) as well. So some day that gang banker may get even more unlucky.
Shot placement, knowledge of the target, and Christian mercy put a critter out of it's pain.
/johnny
Held a CZ75 once. It was like butter.
The number one, irrefutable rule of the gunfight:
The most effective gun is.....
the gun you have
- the hand cannon at home in the closet is of NO use.
I carry a PPK also, got it loaded with Hornady Critical Defense ammo. It was built to pass the FBI shooting specs, and will handle pretty much any situation thrown at ya!