It all has to do with looking down the barrel with whichever eye is dominate, etc. Point your finger and close one eye then open and close the other. Finger jumps tells you its not your dominant eye. When looking down the barrel of a sxs, you normally have to adjust your lead slightly depending upon which barrel your shooting. That's why most skeet guns are O/U. Don't wanna fuss with it.

I like O/U vs. autos because I like all the traditional hunting stuff and pretty engraving. A successful hunt for me would be a single pheasant while letting dog out. So, not much of a meat getter. BTW, easier to collect hulls with a glove and a O/U than digging out from the mud with an auto.