Quote Originally Posted by UltimaLimit
Sorry, bad choice of words. I meant that once you had the Magic Materia, you didn't have to worry about missing them and could level them up at your leisure, wheras some enemy skills (like Trine, Pandora's Box, Shadow Flare--in other words many of the best offensive ones) can be missed and can be very frustrating to get, wheras with Magic Materia you just need AP and patience.
True, but I think that disadvantage is nulled by the fact that you don't have to master Enemy Skills, can use them infinitely in battle, and they all come on one materia.