To be honest most VW dealers don't know their arse from their elbow when it cones to repairing their cars, unless it's the latest model.
I'd always go with a specialist independent, who generally have more experience with a broader range of VW's. The independents also know that if they do a sh*t job they lose custom. Whereas VW know they have a steady stream of customers who are more bothered about having the VW stamp, so don't have to put the effort in.
If I was still looking for a car, I'd much prefer to see stamps from an indy, I can then research them and find out good/reliable their work is.