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If you are using good defensive ammo (Jacket hollow points, not solid core bullets) I don't think you'd have too much to worry about with either the 9mm or .223. The shotgun is a man stopped with just about anything short of bird-shot (at distances within most houses), just don't use slugs in your house, they can hit the bad guy and just keep going. I prefer a semi-auto short barrel shotgun assuming that I hit the target, just feed them the right ammo for your situation.