My opinion:
Better to get it done, and get it done at a good indy rather than a main dealer. Irrelevant of cost, I'd trust a good indy over a stealer.
When I was looking to buy a Gti, I was suspicious of a couple of cars I enquired about that needed a service. Made me think, if the owner hasn't serviced it, is it because they can't afford it, and therefore may have skimped on other things? I started asking leading questions about one of these cars, and it turned out that it hadn't been serviced as the guy couldn't really afford the car to begin with; everything done on the cheap (e.g. budget tyres, patchy history, small issues not attended to). Didn't bother viewing that one.
The car I ended up buying had been recently serviced, but the DSG service had been missed; I haggled that off the sale price.