TVXQ brought back idol groups by kicking off 2nd gen and had the highest selling 2nd gen album with Mirotic. Also had the highest paid fanclub in history.
Super Junior took the baton from their seniors and was the best selling kpop group for 4 years straight. Also the most important group in the Hallyu Wave.
BigBang were the Kings of digitals and the general publics darlings. Arguably the most famous kpop group in the West before BTS.
Three titans of the industry. But who is #1?
I'm not doing a poll cause I want actual discussion.