Me, I own guns of other gauges, but the half dozen I actually take out of the cabinet to hunt and shoot with are all 12s. No other gauge comes close to being as versatile as the 12. Mine range from a double weighing less than most 20 gauges to a near 9-pound target gun with 32-inch barrels, and I shoot loads from ¾-ounce (for clay targets) up to 1 3/4 ounces (for turkeys) out of them.
If you shoot steel shot, it takes a hull the size of a 12 gauge’s to hold enough of the light pellets to kill a duck or a goose. And, as much fun as light, skinny small bores are to handle, I believe it’s easier to shoot well with a gun that’s a little more substantial and hand-filling.