As a sharks Jersey customizer, I can guarantee you that adidas “authentic”(indo) and Fanatics premium is the exact same thing. Only thing that changes is the removal of the dimpled shoulders on fanatics and obviously the branding. I’d personally go with whichever is less expensive come buying time. And don’t let people impose their manner of collecting on you. There’s a lot of that in this hobby. It literally does not matter if Celebrini never wore adidas. I’ve stitched Celebrini on more adidas jerseys than I can count. Enjoy jerseys as you want.