Which prefix do you prefer? I find I use both. I always say Junior-welter and Junior-Middle..never superlight or superwelter. I mostly say superfeather but I have often referred to it as juniorlight. I always use Superbantam and Superfly though, never their junior equivalents. I also use lightfly and not juniorfly, which doesnt seem to be in common usage anyway.
I say junior more often than super for most of the divisions. However, I do say superfly pretty much all the time when referring to 115lbs. I sometimes say lightwelter or lightfly instead of junior as well.
i've always used super for all weight classes, except for junior middle and jr. welter. for the rest it's super fly, super bantam, super feather, super middle.