The B1’s are USA assembled, but legally are considered “made” in Japan. I believe tract is japan, and the razor is China or Philippines depending on the configuration.
I would buy the Mavens. The Tract I’m sure are fine, but from a business standpoint it bothers me that they basically just rode maven’s “direct to consumer” coattails. Couple that with the fact that I’ve still never seen a pair “in the wild” across multiple states and seasons, I just don’t see them being around long term. Don’t wish them ill will, but I just don’t see it happening.
The razors are actually solid if you get a good pair, but there’s a huge sample variation within the line IME. If you go with razors, check every pair in person in store and buy the best pair optically they have.
In short, for my dollars, Maven B1.2, then it’s a coin flip from Tract to Vortex for me. With other optics being between maven and the others for me.