The best replacement for sm3 is nm3.

The best alternatives to sm3 are rated as following:
★★★★★  nm3
★★★★  sm64
★★★★  westone 4
★★★★  um3x
★★★  se535
★★★  tf10
★★  westone 3
★  sm4
★  sm2
  westone um3x

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Google Trends

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sm3
nm3
sm64