The best replacement for sfp is gbic.

The best alternatives to sfp are rated as following:
★★★★★  gbic
★★★★★  sfp+
★★★★  xfp
★★★★  ffp
★★★  mini gbic
★★  glc
★★  rj45
★★  qsfp
★  sfp+ cisco
★  sfp plus
★  hba
★  lc
  sff
  ffp scope
  media converter
  sfp
  cx4
  sx

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sfp
gbic
sfp+