Opinions on Pros and Cons of:
1. Pump Action Shotgun
2. Auto Loading Shotgun
3. Double Barrel Shotgun
Manufacturer and Model ?
OK, I have a confession to make . . . I'm a shotgunaholic . . .
I shoot skeet nearly every Wednesday night and again on Sundays (or five-stand or sporting clays). I love shotguns and I love buying shotguns. I scour Gunbroker and pawnshops for good deals and am nearly incapable of letting a good one pass at the right price. I've lost count, but I probably own three dozen shotguns. I have pumps, autos, side-by-sides and over/unders. I love them all.
I also shoot all of them . . . well, most all of them. The ones that I hardly ever shoot, the ones that I love the least, are the so-called home defense shotguns. Still, I have a half dozen of them. Did I mention I can't let a good deal pass?
The home defense guns sit propped behind doors and occupied easily accessible spots right inside the safes. They don't get shot much though. What the hell do you do with them? Punch a whole lot of holes in cardboard I guess. Sometimes I'll take one out and run a round of skeet with it on a lark, but otherwise they sit.
So, to the original question . . . in terms of short-barrel "home defense" guns (and the the short barrel is the only thing that make a shotgun a "home defense" gun, IMO), I own three 870 Wingmasters, a Remington 11-48 auto, two Ithaca 37, and a Mossberg 500. I like them all. (I have other repeater shotguns, but not with short barrels)
But, if you're asking for advice . . . .Go to Gunbroker or watch the surplus gun websites. Pick up a used Remington 870 WINGMASTER (not an express). You're looking for an old cop gun that rode around in a squad car or prison armory and got beat up, but only got taken out and shot a few times a year for qualification. The simplier the better. I prefer 20 inch barrels, but 18 is fine, too. You want a simple bead front sight. You don't need rifle sights or ghost rings. A wood stock is better than plastic. You don't need Maglight forearms, Magpul stocks, side-saddle shell holders or any of that ****. You just want a simple, plain, reliable shotgun.
If you shop well, you'll be able to pick one of these up for $250 or less. The last one I bought is stamped "DPS" on the side and looks like hell on the outside. Scratched up wood something fierce. When I torn it down, I discovered the thing had NEVER been shot. I paid $180.
When you get your old cop gun, tear it down. Remove the trigger group. Use some oil-soaked steel wool and clean all the old crud off the inside (watch the fingers, you'll slice yourself if you're not careful). Put it back together. Shoot a few shells through it to get comfortable. Maybe shoot a round of skeet. Clean it again. Oil it. Put it behind the door. Forget about it. Chances are extremely good you'll never need it.
That's what I do, anyway.