The best replacement for sl3 is sl5.

The best alternatives to sl3 are rated as following:
★★★★★  sl5
★★★  sl1
★★★  sl4 tarmac
★★★  sl4 roubaix
★★  sl2
★  sl4
★  tarmac sl4
  sl4 specialized
  traktor scratch pro
  sx3

Your alternative for sl3 is not listed? Suggest!
Speaking about sl3, one probably shouldn't forget about serato dj.

Other search terms related to sl3 and their ratings are:
★★★★★ serato dj
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Google Trends

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sl3
sl5
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