BTS or Garrett

I need a new turbo for my A3 BKD.
How does the quality comparison between BTS and Garrett look?

And what is the difference between BTS and BTS Blue?

BTS does not manufacture its own chargers, but is merely a distributor for Garrett and other manufacturers.

BTS Blue are reconditioned older chargers, upgraded by BTS themselves.

That means the BTS Blue Schiene is not recommended.

So, I quickly ordered a BTS, and according to the label, it's a Garrett.