The best replacement for iridium spark plugs is platinum.

The best alternatives to iridium spark plugs are rated as following:
★★★★★  platinum
★★★★  platinum spark plugs
★★  double platinum
★  e3
★  denso iridium spark plugs
★  e3 spark plugs
★  ngk iridium
★  ngk spark plugs
★  laser iridium
★  regular plugs
  ngk
  double platinum spark plugs

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