People, you do know that most men's underwear, whatever its brand and price point, is pretty much made in the same set of ever-shifting low wage factories? Sure, if you are going to have your silk smalls measured and hand-made by Italian virgins, you might get something different. But otherwise, uniqlo, muji, edwin, calvin klein, jockey - just get whatever happens to fit you (and this is completely ungeneralisable because we all have very different sized and shaped buttocks, thighs etc.). I know what fits me, and what I am used to, and I stick with it. There's no real point in recommending this brand or that to anyone else!
So just because two products are made in the same factory, there can't be any quality difference between the two?