its common knowledge that a shotgun wit some varient of pdx ammo is like ace for home D...but for instance in my case i prefer to have a handgun for home defense too...and i wont go smaller then a 9 for that...also you gotta factor in stuff like distance to ur neighbors house, penetration power of your gun/ammo...sound, personal preference on grips, sights, ect,ect,
i dunno much but i hope that helps somewhat