As a man with a big butt (damn squats...
), I can say that, in order of preference for RTW suits, I prefer single-vented, then double-vented, and no vents last. Double-vents can be pushed open by a prominent butt, thus never appearing to close. But no vents is even worse, as it pulls the quarters so far away from each other that the look of the suit is frequently ruined.
Lately, I've been wondering if my preference would change if I had something made for me by Chan. Couldn't he adjust the cloth such that there would be room for my butt without pulling the vents? I prefer the look and practicality of double vents if my butt didn't ruin it.
Sometimes I wonder why I spend so much money and time on weight-lifting, which then requires me to spend more money and time on getting clothes to fit properly. Ectomorphs have it easy.