Use the 9mm cause its usually higher capacity, then shoot em a few times and if they dont stop shoot for the head.
again i will hit this point, in the context of self defense, ccw etc, the head is generally not the best option, and here is why. the head is a small target, and it is gonna be moving, and harder to hit. additionally the possibility of by standards being at the scene is highly likely and you the person defending yourself is responsible for every round that you fire. the pelvis is where i train to go after the high center chest. why? it is as wide as the chest, as well it is the trunk, you chop it and the assaliant will be out of the fight, as well there are some really nasty things that run through that part of the body, the likelyness of causeing a threat to stop possing a hostile threat to you by hitting them in the pelvic region is very high.
I wouldn’t want to look over my shoulder for the rest of my life. I would shoot to kill. Double tap…
this is often what "men" say, the macho amoung us, and there was a time in history where this might have been fine, and a shooting was a shooting, not the case anymore. and if the jury finds that out, you will be spending alot more time in jail.
you do not want to take a life if you don't have too, yeah it sounds macho and manly when people say it, but many of the people that have become shall i say humble and they understand why it is the last thing you want to do. it is easy to sit behind a computer, with a gun at your side, and show your "A" type personality, it is a whole different matter in the real world when the shooting stops.
you will have plenty of things to worry about if you get into a shooting, you don't need the taking of a human life on your mind unless that was the only way out, the only that you could stop him from being a threat to you. you have the gun fight, the legal fight, the media fight, and you will have the mental and emotional fight to worry about. even if you were 100% right and you did what you HAD to do.
you are not aware of your suroundings anyway? why would getting into a defense sittuation where the assaliant live, cause you to do that, you should be aware of what is around you already, if something like that has to happen for you to be in the right mind set you have alreayd lost, and you are way behind the power curve already.