[racine]

".. Boy, I'm probably going to get torched for this one but, here goes.....
I'm not crazy about pistol grips on a shot-gun, especially if it's for home defense. I think it was solution in search of a problem that the manufacturers were happy to cultivate in order to sell some product. They're just a whole lot tacti-coolier than a standard stock right?
For a home defense shotgun I view them as a drawback. You watch the idiot box and generally when someone is moving through a doorway with a shotty it's with barrel almost straight up, and stock down. If the badguy were to step out and grab that barrel you'd have a hard time bringing it back into play.
A different school of thought is to move through the doorway with the barrel down, stock up. If someone were to grab the barrel and try to keep it down, you could always lever the stock down, which will automatically start the tip of the muzzle moving up. At the very least you could probably pop someone in the knee. I think it would be pretty tough to do with a pistol grip shotgun. Ergonomics just aren't right.
Plus, executing the butt stroke is a whole lot smoother..."

Some well known police shotgun trainers actually advocate carrying the shotty barrel up. The rational is that someone grabbing the barrel allows the shooter to pull back, fire and decapitate. Carrying barrel down supposedly exposes the shooters torso to assault.

I have shot with both types of stocks and hunt with the conventional. I found that my last rabbit hunt would have been much less stressful had I had the PG stock for many close quarter shots at close range. That's just me and my history of a torn rotator cuff. Having a PG stock seems much easier for me to control for 3gun shooting and adds a familiarity with my other PG rifles. There's more than one way to skin a cat.