The best replacement for tnc is sma.

The best alternatives to tnc are rated as following:
★★★★★  sma
★★★  bnc
★★★  mnc
★★  n connector
★  tnc
  pro 500
  sma connector
  aspire
  5200
  rp sma
  sma connectors
  tns
  rp-sma
  n connectors

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

Other search terms related to tnc and their ratings are:
★★★★★ mixw
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