Originally Posted by tieler
you should stay away from 9mm for home defense, if youre shooting close quarters and want a handgun thatll really pack a punch to the person on the other side get a 40 or a 45. for longer guns go with a 12 ga with an 18 in barrel and a pistol grip both front and rear
Nothing more than my own opinion, but I don't really agree with any of this.
9mm is an adequate defense round and a great learning platform. Almost any calibers bigger than 115gr are also fine defense rounds, although some may be less ideal for the new shooter. 357mag and 45acp are top shelf when it comes to common caliber centerfire pistol defense, though the cost and minimal recoil of a 9mm is sometimes worth giving up (what, 10% lesser performance?) what those more powerful calibers offer for the new shooter.
A youth framed 18-21" 20ga loaded with #3buck would make a pretty perfect home defense gun for multiple household users. Stockless pistol gripped SGs look pretty cool, but the traditional stock is a little more practical for most people.