Hello Andy,
I take it you haven’t owned the car since new, and don’t have any idea what pads and discs are currently fitted to the car.
If that is correct, then it’s fair to say that the chances of you being disappointed with whatever you buy are greatly reduced.
You are going to get healthy-debate varying opinion on here, about brands and that is good.
Personally, I’ve always stuck with Audi pads, bought at discount, at not much more than other recognised brands, and they have always done me extremely well over 170K miles.
I am ‘experimenting’ with Brembo on our non-Audi, and a similar marque family vehicle, and they seem to be as impressive as you would hope for.
Discs? Audi discs are daftly priced, so I’ve stuck with Brembo in the past for discs.
My search source for competitive prices for Brembo from reputable sellers has been EBay.
You could also try Parts in Motion ( no connection, but they seem to get a free plug from me!).
If you are DIYing this, then I would recommend you invest some valuable time to ensure the disc to hub mounting face is scrupulously clean - often overlooked.
Kind regards,
Gareth.