Consider your parameters: You'll probably be either at home, with the concerns of penetration of other rooms or your neighbor's walls; or in transit from some sort of errand. This issue of over-penetration would favor the .223 round.
Relatively short ranges without the need for 300- or 400-yard "knockdown" power; possible multiple foes, but I'd assume discretion if foes are more than, say, two to five. Ergo, box-magazine autoloader.
If you are faced with some cities' anti-self-defense political structure--and these political structures will continue to be jealous of their prerogatives--then AK clones and black plastic will continue to cause negative vibes. Since you are not thinking in terms of protracted firefights of hundreds of rounds at a time, I see no reason why a Mini-14 would not meet your needs.
.223 ammo costs less than .308. A .223 rifle is easier for repeated aimed fire than one of heavier recoil.
FWIW, Art