I've owned 3 of the guns you mentioned. The 391, SX2, and the SBE II. The winchester sucked. I had a lot of problems with that gun. If it looked at a piece of dirt, it jammed. My buddy went through the same thing I did at the same time, with the exact same gun. My advice would be to not buy the SX2.The 391 and the SBE II, are the best two semi-auto shotguns I've ever shot. What I really liked the bestwas the perfection in cycling and never jamming at all. The 391 was a much better looking gun, but was a little harder to clean. The SBE II, had a recoil system built into the stock that made it hard to beat. I do not think you could go wrong with the SBE II, Or the Beretta 391, both are great guns!!! Good Luck!