>>5471286Leggings are tight at the bottom near the ankles, yoga pants aren't. Also yoga pants tend to have a colorful band at the waist, some say Pink or other brand names. kind of lame. Both make the asses look great, leggings really extenuates the legs too though.
Spandex is a material commonly used in both along with cotton or nylon.
Also spandex shorts are great too!