I chose the Semi Auto .22 but upon more thought that would be more for TEOTWAWKI. In a SHTF situation I would go with my 1300 Defender due to sheer stopping power in a variety of situations. The reason I would take the 22 in a TEOTWAWKI situation is the ability to carry a lot of ammo for it. SHTF lasts maybe a month? TEOTWAWKI is much longer (permanent?) so having the ability to carry, in my estimation, 10 times the ammo vs 12ga is the deciding factor for me.