It depends on what your house layout, the construction, neighbors and other factors like that. I have at least one gun in every room in my house and most are pistols. If a bad guy comes in, that is probably going to be what I engage him with. That said, if I got to choose, I would grab a 5.56 AR-15. Do you have kids behind a drywall wall or do you live alone in a brick house or in a apartment or townhouse?