I dont like OU, LC, or Ubers. I legit can't stand them haha. I dont like OU or Ubers because I dont enjoy uber powerful pokemon (though tiering is relative) that are, well, over-used. Also I dont like using legendaries. And LC I could never understand and I dont like the weird items, IV's, and low HP's. just a preference.
UU was my thing back in the day. I had an unbeatable team. Only lost once due to hax in the final match of a tournament. And it had no mega! NU, RU, or UU are my favorite depending on how i feel. Sometimes I really love VGC as well, but the use of legendaries frustrates me.