I have personally gone completely across the gamut of 12 to 20 back to 12. When I started out I shot a 12ga. In my twenties on into my late 40's I shot only 20 ga. Picked my shots on bigger birds, like pheasants and ducks, ( when we used lead). Now, I'm not as quick on the rise, and my eye sight is not as sharp as it once was, so I have gravitated back to the 12 again. I started my daughters out with 20's, now because of killing power with non-lead loads, transitioning to 12's. It's the killing power that is the deciding factor to me. Lot's of cripples with steel or steel substitutes, possibly due to inexperience with the loads and their ballistic coefficients, and peculiararities, in the 20ga. For me those go away with the superior bore diameter and dynamics of the 12, with non-toxics. With lead, the newer lead loads 12 or 20 are pure lethal, with the nickled shot, and superior wads, have made chokes almost obsolete. With any load, I believe that there is simply no debate as to the superioity of a 12 over a 20. Advantage to a twenty was ever only related to weight. New alloy 12's don't weigh anymore than my old 20's. If you don't like the recoil, stuff your 12 with lighter loads, and you will still most likely equal 20 ga. in pattern efficiency, and killing power. Even so I have a slew of 20's. For pheasants, I prefer the knock'em dead 12. I don't enjoy the long-shot, hit multiple times in the butt, chase across the corn field quartermile dash for me or the dogs anymore. Much less the one you spend an hour looking for and can't find. Resource to valuable to risk the waste.