I find the opaque leggings of current fashion much more attractive. The sheer stockings always look they're about to run and they show defects, and don't have the overall shaping effect that solid color leggings do. Nor do they provide the kind of color contrast with the rest of the outfit that modern leggings do.
I think a skirt/shorts can get super short with opaques and just seem playful, casual, even professional and not as transparently (AHAHAHAH bad pun) sexy. I love black opaques with micromini skirts. It lets you wear the skirt that would otherwise be way too risque to the office or out during the day. Plus it means you are way less restricted by wearing a skirt than with sheers. You can spin, jump, sit in the grass, etc and not worry that the whole world is seeing your underwear or crotch. Definitely the modern girl's choice!
Please note that I am talking about sheer tights and opaque tights. Leggings (as in no feet) worn as pants is a different fashion question. One that, personally, I don't find very attractive unless you are exercising or lounging at home.
I ma be young, but I'm an old fashioned gal at heart. I love all really fine, quality sheer hosiery, be it nylon stockings, pantyhose or tights. Especially the older vintage/retro types. I'm kind of a hosiery and high heel junkie.
i like both! I like leggings for casual/cute situations. and when I want my butt to look cute lol. but when it comes to formal events, I like a dress with dark nylons and high heels. it just has a subtle somewhat classy/sexy appeal. for both leggings and nylons though, if not worn just right, a girl can look trashy...