The best replacement for platinum spark plugs is iridium.

The best alternatives to platinum spark plugs are rated as following:
★★★★★  iridium
★★★★  regular spark plugs
★★★  iridium spark plugs
★★★  copper
★  copper spark plugs
★  regular plugs
★  copper plugs
  normal copper spark plugs

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platinum spark plugs
iridium
regular spark plugs