Any modern handgun you can buy will very likely go BANG when you pull the trigger. It’ll shoot minute-of-bad guy without fuss nor muss. Well, maybe a little muss. But generally speaking, when it comes to a carry gun, you’re far better off worrying about your training that the caliber, type or yes size of your firearm. With one exception: the trigger.
As for the argument that a carry gun trigger modification can get you in trouble in a post-DGU prosecution — he wanted to shoot someone! — meh. Anyone who accepts the old saw “it’s better to be judged by twelve than carried by six” isn’t going to worry about that.
So, what gun do you carry? How’s the trigger? How important was the trigger to your buying decision? And have you modified your carry gun’s trigger?