Hmm, Decisions, decisions...each may have its own advantages/disadvantages. The o/u with 28"bbls will be about 3" shorter than either the pump or auto with 28inchers, and yes,that can make a difference. The longer sighting plane is more desirable-especially if you are planning on sticking with it. The turkey choke for the pump is way too tight-you could always buy a mod or full, and a pump is fine for trap singles (doubles, too, if you are realy smooth with it), but the recoil from a lightweight pump can be brutal. The auto will shoot softer, and if the bbl length is at least 28'' and the gun fits you well, that would be my choice. Just remember that it will throw your empties at the shooter to your right if you are a right- handed shooter. There are simple, easy to attatch shell catchers for many makes of autos. Try each of your guns, and I'll bet that if you are not used to shooting with your gun premounted it will be a whole new ballgame.Try this tip, too. If what you are shooting is primarily 16 yd trap use 1 oz loads of 8's. You do not need anything heavier than this-guaranteed.