My fiance INSISTS on wearing a different tux than his groomsmen because he wants to stand out... I told him usually he would just wear a white/black vest underneath instead of the color that the parties will be wearing... but he really wants to wear this particular tux.
The groomsmen cant wear this tux because the best man already has a tux, so we chose tuxes to match his so he wouldn't have to get another one.
The tux he likes DOES look nicer than the ones we've chosen, but would it throw off the pictures or look weird if he has a completely different tux?
(He always says "Well YOUR dress is going to look completely different from your bridesmaids!".... :P )