The Genuine belts i have seen have the VW,Audi logo and is also labelled Gates/Dayco aswell.
The tensioners as far as I know are made by INA which is supplied in the GATES and DAYCO kits anyway.,
My point being that if you consider a belt with both
VAG marking and DAYCO/GATES on to be genuine and worth ££££ more than a belt with just GATES/DAYCO then go
ahead and spend the extra, but I don't see the point as your gaining no extra quality................