The best replacement for nkotb is bsb.

The best alternatives to nkotb are rated as following:
★★★★★  bsb
★★★★  backstreet boys
★★  new edition
★  nsync

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Speaking about nkotb, one probably shouldn't forget about 98 degrees.

Other search terms related to nkotb and their ratings are:
★★★★★ 98 degrees
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