first off, birds don't care what you use to shoot them with. second, if you want to hunt with some class, you will use a sxs, straight stock and double triggers. i currently own and hunt most every year with about 20 different doubles. i own one beretta o/u and shoot it well. it's in a 28 ga. and just this last week shot 6 geese and 11 ducks with it, i call it my goose gun and always have hated the damn thing and the selector even though the beretta selector is the best on the market. have been using doubles for nearly 50 years and love em'. cheap one's are like clubs, good one's are like fine wine. while the right barrel is usually shot first, with the double trigger you do have a choice and that can be made even while the bird is in flight, you can't do that with any single trigger gun, period. big deal, maybe not but it is a choice and i do use it. one thing to consider is that when buying a double is to make sure the gun is on the right size frame and most of the cheap one's are not. currently my love is a new aya in 28 ga. box lock with 29 " barrels and lop of 14 3/4 at about 5.5 #'s.
cheers