Last I knew Motive was made in Italy, and Yukon in Korea. Motive has been nice in my experience, and I've had no problem with Yukon but have not done Yukon in a 9" Ford, just Dana 60, 8.5" 10-bolt GM, and 8.8" Ford.
Last Strange/U.S. Gear I did was about 4 years ago,12-bolt Chevy car, came out good. Would be a shame if they are chinese now.
Worst gears ever in my experience were Zoom.
I had a set of Precision Gear for an 8.8" Ford give me a real challenge to get set-up a couple years ago, 4.10 ratio. Did not even come close to correct at the marked pinion depth.