HD DVD and Blu-ray is basically the same software technology, with different optical disc media (and even the media isn't all that different, both using blue laser technology).
Maybe I'm wrong, but more work seems to have gone into making HD DVD encodes than Blu-ray ones, since many of the Blu-ray ones from the previous HD DVD exclusive studios are basically just the same transfer as before. I think perhaps because HD DVD was the underdog, they gave extra attention to things like encoding. But now that Blu-ray is the only game in town, there's almost no need to make a good transfer (in fact, there's reason not to, as you can always release a super duper extra special collector's edition with a better transfer to get people to buy the same movie again).
Maybe I'm wrong, but more work seems to have gone into making HD DVD encodes than Blu-ray ones, since many of the Blu-ray ones from the previous HD DVD exclusive studios are basically just the same transfer as before. I think perhaps because HD DVD was the underdog, they gave extra attention to things like encoding. But now that Blu-ray is the only game in town, there's almost no need to make a good transfer (in fact, there's reason not to, as you can always release a super duper extra special collector's edition with a better transfer to get people to buy the same movie again).
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