Pacific island kava is the best, cuz that's where it started. But, outside of respect for tradition, if kava was as popular as marijuana and we could grow it in the states, the plant would become a kavalactone producing beast. Just like what was done with the old natural dirt weed. Vanuatu is actually farther from Hawai'i than California is:
- 3,521 mi from Vanuatu to Hawai'i
- 2,467 mi from Hawai'i to California
Of course, they still have fairly similar climates/soils despite the distance. Had the Polynesians eventually made it to the mainland US and figured out how to keep kava alive, then we'd consider that kava to be just as good/legit as stuff from the islands.