Bosch and Beru should both be good. I haven't seen Berus for the D24/old VW application but they probably exist. I don't see any reason to use anything other than Duraterms. Don't know about NGK's, Densos, etc; those are usually great brands for spark plugs and for Japanese diesels that they originally came in but Bosch is always a good choice where it was the OE setup. (IMO same goes for Isuzus and Mitsus etc that originally had Denso plugs -- I would use Densos there over Bosch).
I have seen Autolites and Champions have the tips get soft and swollen up in Volvos; I would use almost anything before I put one of those in....
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