Guns I consider superior to the AR for home defense:
1) A double-action revolver in .38 or larger caliber, points going to larger. Limit velocity, maximize bullet weight. Under stress, all the homeowner needs to remember is to pull the trigger. No safety, no racking one in, no accidentally dropping the magazine....
2) 12 ga pump shotgun, #4 buck. Simple to use, easy to shoot. Lots of pellets, and the muzzle is HUGE when you're in front of it.
3) 12 ga shotgun, double barrel, #4 buck.
4) A DA auto pistol, as big as they can handle. Easier to navigate through a house with, easier to escape a house with, only requires one hand in a pinch, easier to enter a car and escape or drag along a spouse/child/grandchild.
5) A SA auto pistol, as big as they can handle. Same, but you have to cock it, and increased risk of AD.
2,3,4 and 5 are soimewhat interchangable - depends on experience.
The AR is a fine platform, as is the AK and variants of both. It would be the top of my list of center-fire rifles. It does, however, require a skillset (and associated practice) that is greater than the others. Sure, SWAT teams use them in close quarters (which is where home defense happens), but a simple survey of most LE agencies whould show that officers all carry a handgun, mostly have quick access to a shotgun, and rarely have anything else.
ARs are like great cars (your choice of a new Corvette, Porsche, Maserati, etc) in that they do several things very well - but to claim one of them is the best for hauling gravel or towing travel trailers is .... well, you know!