The best replacement for suju is snsd.

The best alternatives to suju are rated as following:
★★★★★  snsd
★★★  2pm
★★★  dbsk
★★  1d
★  ss501
★  sm*sh
★  tvxq
★  s9b
  laruku
  hey say jump

Your alternative for suju is not listed? Suggest!
Speaking about suju, one probably shouldn't forget about snsd.

Other search terms related to suju and their ratings are:
★★★★★ snsd
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Google Trends

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suju
snsd
2pm