The best replacement for vapour barrier is air barrier.

The best alternatives to vapour barrier are rated as following:
★★★★★  air barrier
★★★★  moisture barrier
★★  dpm
★  vapour retarder
★  damp proof membrane

Your alternative for vapour barrier is not listed? Suggest!
Speaking about vapour barrier, one probably shouldn't forget about celotex.

Other search terms related to vapour barrier and their ratings are:
★★★★★ celotex
★★★★ spray foam
★ spray foam insulation
★ kingspan
You have in mind a companion for vapour barrier and it is not yet here? Propose!



Google Trends

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vapour barrier
air barrier
moisture barrier