Echo3 said:

Im curious about the HD DVD of GRAND PRIX. It is confirmed that the HDDVD and BluRay use different transfers, but I have not read anywhere if one is better than the other.

Im pretty sure the HD DVD has standard Dolby digital, wheras the BD had Dolby Digital Plus. Not sure if there are other differences

Really the BD had the same master as the dvd http://caps-a-holic.com/hd_vergleiche/comparison.php?art=part&x=451&y=281&action=1&image=0&cID=675&cap1=3907&cap2=3897&lossless=#vergleich