Best carry self-defense caliber for you?

There is such a little difference between the 9mm and .45 regarding 'knock down' ability. I carry a Glock 22 with a 9mm barrel. I practice...a lot. I am looking to purchase a new 9mm for EDC, maybe a Sig...

I have a SA XD9 compact. Love it. Small enough for easy concealed carry. Double stack mags mean I can bring plenty to a fight, fits very comfortably in my hand, and the recoil is very controllable. I can easily put multiple consecutive rounds on target in a short time. And if I ever want to change caliber, it's just a matter of swapping out for another XD barrel of the same length and getting the appropriate mag. I've tested this theory with my SO's XD 40.

XD .45.. Love it.

I like the old .45, and for closer contact I have a collection of swords, daggers, bayonets, throwing stars,/knives, and knives. And, YES, I keep them sharp!

Good mix of conceal ability and firepower.

A Glock 26 Gen4 on my hip and a Sig Sauer P290 RS concealed with an extra magazine for both. A Springfield XD at home in case my family needs protection while I'm gone.

I noticed a few comments regarding summer/winter guns and the 1911 being too large to carry. I live in the deep south and carried my Detonics forever and it is only marginally smaller than the std. Colt combat commander. I have never had a printing or carry problem even with a T-shirt, although I don't use a holster Just a belt clip and it sits low on the belt line in small of back. As to weight, the aluminum framed Star .45 is small/light enough to EDC but possibly not robust enough to shoot regularly.

Glock 19. Best Pistol I have ever shot. I have two of them and I'm turning one into a racegun for IDPA competition.

My summer weapon is a Glock 26 9mm & my winter weapon is a Sig .357. I am thing of getting an XDS .45 for my summer carry.

I have an old .45 Detonics that I have carried for decades SOB on a Brown & Pharr belt clip. same length but thinner than a snubby .38. 3# trigger, a lot of out of the box custom work, Packy grips, two spare mags. I sometimes just grab my Makarov. If headed for the badlands my Glock .40 LS.