If the SHTF, the 20-guage nut jobs will be sitting around with empty guns, thinking, “I should got a 12 gauge!” Burp!
Why a 12 gauge?
Because I can’t find an 8 gauge! Because you shouldn’t have to pellet someone twice! Because a 20 gauge will make a hole in them, but a 12 gauge will shove them out the door!
OK. Reality? I use a 686+ for home defense. 10 years after I stopped hunting with them, I gave my shotguns to my sister’s kids, who love hunting and immediately put them to good, regular use.