I'm interested in knowing the conventional wisdom, and people's experiences, with varying vent rib widths.
My current target shotgun is an 11-87 Sporting Clays with the stock rib; I suppose it's about 8mm. I seem to remember that often O/Us used to have 10mm as standard. And, I think the Browning GTI (or perhaps Ultra?) had like a tapered rib that started at like 13mm and tapered down to something smaller (10?).
And, of course, there are aftermarket stick-on ribs or barrels with wider ribs which can be added. Are they worth it? The 'sight picture' would obviously change a lot, but does it matter? What's the advantage of a wide flat rib that looks like you're staring across an aircraft carrier deck? I'll admit I've never shot a gun with a wide flat rib but I've handled them.