Another angle you may or may not wish to consider:
If one day you are looking to sell then a service history which shows services have been carried out at VW will offer greater peace of mind to 8/10 buyers* when you are looking to sell your car on - a key selling point for most buyers is a Full VW Service History. Thus making your car more saleable and halping you to maintain re-sale value.
The other 2 in 10* punters probably aren't bothered or are willing to accept that services were carried out at a reliable garage with genuine parts.
*numbers made up for sake of making the point, I'm not quoting official market research