I carry guns that conceal well enough to permit me to carry them all the time. That’s important.
I carry guns that are in a service caliber, that is consistently capable of producing adequate terminal effect for a pistol. That’s important.
I carry the guns I shoot best, measured by repeated performance on different days through tests that emphasize the rapid and precise placement of two or three rounds at varying but realistic distances. That’s really, really important. For me, time from the holster to a high probability hit on a B8 bull at 10 yards is ~money.~
Given all that, I carry as much capacity as I can. I carry a reload even though I don’t think they’re very important for a single stack, because I can, and I do not carry a reload for a double stack because I find comfortable concealment difficult.
In winter I can and do carry a G17 much of the time.
In summer I usually carry a lightweight commander.
I feel equally well armed with each because my measured performance with each is very comparable.
I occasionally carry a G43 or a J frame. I am aware that this is a poor choice ~~ not because of their capacity, but because of reduced performance (of me, and especially for the J, of the cartridge). This is usually a failure to dress around the gun. Adding 2” to my chest circumference and reducing my belly made a significant difference in reducing occurrence of that minor failure.