The history of girlgroup in SM,SNSD is the most 人気 n most successful girlgroup,isnt it?and tell me why?

1. Because snsd are nine walking angel.
2. They have good chemistry and strong teamwork.
3. …and not to mention, they have really really supporting passionate ファン all around the world.

I think they're the best K-POP girl group :) They have many many ファン cuz they're so beautiful and talented

Because I think SNSD is the longest running Girl Group of SM having achievements outside and inside Korea. S.E.S has maintained their popularity for about 2 years and CSJH is still ongoing but they dont have much ファン as SNSD has. It seems that they were the first girl group who won the GDA Disk Daesung last 2010...please correct me if I'm wrong.