Unless you're up against someone who has one. 9 shots may not be enough. Should be, but what if he's running and dodging and weaving? What if there's two intruders? Do you want to be the nut left behind? Dropping your clip in the heat of the moment and trying to jam the next one in? Trying to find the next one? Home defense man!
Really, don't even get a handgun or semi-automatic rifle. Get a shotgun for home defense.