no arguement there. I always say use the biggest caliber you can shoot accurately. Me & my wife prefer cal. 40 & 45 ourself. We don't think much of 9mm and smaller even tho they might be sufficient with good shot placement.
In our household the only place the 9mm has is for training at gunsite or blackwater we plan on going to since 9mm ammo is cheap and shooting 500 rounds + a day with a .40 or .45 gets exhausting.