First in a home situation, you are probably in really deep **** if you can't resolve the situation with 5 to 7 rounds of buckshot, If you think you need the 30 rounds of an AR-15, then there must be a reason of overwhelming firepower on your opponents, which means that between the 2 of you, your family, your home, your neighbors and their families are at risk.
Beyond the tactical considerations, in today's environment, one has to consider the aftermath of shooting someone who is probably a neighborhood teenage hoodlum, and you being the rich white guy who unloaded an AR 15 into him. A shotgun, even in it's most Tacticool configuration is infinitely more PC than a "black rifle."
Look at what happened to those "rich white lawyers" who just waved an AR-15 in their front yard. I'm suggesting if they had been waving a Benelli M1 they would have avoided being involved in a lot of crap. Homeowner protecting homestead with shotgun is always going to play better than "radical white guy waves AR-15 in front yard".
My go-to HD gun is a Benelli M1S90, but I wouldn’t hesitate to use an AR.