It was Big Bang and this isn't even debatable. To a much lesser extent even, it was 2NE1.
No rant. Just a declaration I needed to make after again seeing awful revisionist history and erasure of the biggest boy group of their era.
YG would be nothing without Big Bang, and they utterly failed at replicating their success ever since, to the point they have become dependent on recycling the 2NE1 formula instead.