Yea I've had discussions with other KPOP fans and I think Ditto is so popular because it's UNLIKE any other KPOP song. It pulls influences from other genres. OMG is great, don't get me wrong, but it sounds like a normal k Pop song with hip hop influences, which isn't a bad thing.
But overall I think Ditto, fits the group better! OMG is still great btw
