Warranty is about to expire, do I stick with the dealer

[primitivoconner]

Warranty is about to expire, do I stick with the dealer or find a certified alternative?

So my A4's warranty runs out in about two months and I've been thinking about where to take it after that, because the dealer has been fine but the prices are getting harder to justify now that I'm paying out of pocket. A colleague mentioned looking into Certified Audi repair and service in Musaffah Industrial Area since apparently you can get the same standard of work for less once you're off warranty, and I'm curious whether anyone here has made that switch. Did you notice a difference in the quality of work or the way they treat you, and did it actually save you anything meaningful? I'm also slightly worried about resale value if the service history isn't all dealer stamps, so if anyone's sold an Audi after switching to an independent I'd love to hear how that went.