I’ve had both fixed trigger Perazzis and Perazzis with the barrel selector on the tang with the safety. Out of habit I always would shoot the bottom barrel first (that’s what you’re supposed to do, right?) On the rare occasion in which I’d select the top barrel to fire first, I’d usually forget to switch the trigger back to the bottom barrel first. Only way I’d be reminded of this is when I glanced at the gun and realize the selector was on the top barrel. I never could tell from the recoil which barrel fired first. I’ve come to the conclusion that for most shooters barrel selection is not important, and for the most part choke selection isn’t either when shooting at targets. This goes for both SxS and OUs.