AR or shotgun for home defense?

RECOIL article by Aaron Cowan looks at which would be good for home defense.

http://www.recoilweb.com/ar-vs-shotgun-for-home-defense-again-39177.html
http://www.recoilweb.com/ar-vs-shotgun-for-home-defense-again-2-of-2-39203.html

From: RECOIL