The best replacement for extruded polystyrene is expanded polystyrene.

The best alternatives to extruded polystyrene are rated as following:
★★★★★  expanded polystyrene
★★★  polyisocyanurate
★  polyiso
  expanded
  extruded polyurethane

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No companions for extruded polystyrene have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of extruded polystyrene in all years. Click on graph for more.
extruded polystyrene
expanded polystyrene
polyisocyanurate