I’ve seen people worry about all sorts of things when discussing handguns for concealed carry, but one which just isn’t worth your time is the length of the barrel. It’s certainly easier to hit a target more accurately with a longer barrel, but with concealed we really are only talking about stopping a threat and if someone is shooting further than seven yards I would begin to wonder if they really were threatened.
Below is a video from hickok45 and his results with three Glock pistols using a chronograph. While the results may differ in different firearms it really goes to show length is just not a consideration for your concealed firearm. The difference in stopping power is going to be negligible. What you should spend your time on is being able to engage the target and your marksmanship. It’s a video well worth your time.