>>329396014
Depends on where he lives.
Price is without shipping and (most likely) customs. If those come together, the price difference between vive 3 and tundra shrinks even more.

Vive is an established company with a working RMA, especially in the eu (2 years, baby).
Worst case, Tundra being USA only company, shipping from the US and doing their RMA in the US only.
As much as I like their 1-Dongle-3-Tracker-Stuff, there is more to the tracker decision than purely: It is less expensive in their storefront.