I own only SxS's - I never adored a O/U. Your eyes are horizontal, why not the barrels?
Because one of your eyes is dominant, that cliche is irrelevant. I have used it as a joke myself, but never seriously. I have been a serious student of the shotgun for many decades now, having mostly given up both pistol and rifle competition. If there was an advantage to using a two trigger gun for serious sporting clays competition I would be shooting one. There isn't. In fact, there is a slight
disadvantage. Not just because I say so, but because 99.9% of the winners say so. Would someone please explain to me the reason that you believe "instant choke selection" is an advantage (by having two triggers) in a sporting clays shoot, when you know before you ever say "pull" how much choke is needed? Show birds ensure that you know beforehand where the bird will be.
I cannot prove this, obviously, but I believe that most people who claim to favor "instant choke selection" don't shoot a shotgun enough to be
able to choose, in a split second, which barrel/trigger to go to. That would take determined, rigid training to get ingrained into your shooting. I have shot two trigger guns since I was eight years old (I'm now 64), but not exclusively. I see two triggers as no disadvantage to high scores in sporting clays, but I
do see the S x S, overall, as a disadvantage, as much as I enjoy them.
I would really like to look over the list of competitors and the scores at that shoot you mention, salopian. Could you provide a link to it? Certainly a "large clayshooting competition" would have the scores posted somewhere on the 'net.
SRH