The following is a small part of
this article Compare One Movie on Both Formats
When I compared Warner's Harry Potter and the Order of the Phoenix discs, the Blu-ray edition in a PS3 and the HD DVD in an Xbox 360, the differences were startling. Never mind that the HD DVD has an entire online component that the Blu-ray can't yet implement, with features such as mobile downloads and user-organized live screenings. Never mind that you could watch the entire HD DVD with pop-up actor-commentary windows on screen—if Warner had implemented this in the Harry Potter Blu-ray, it would have been compatible with exactly one currently shipping Blu-ray player.
The surprising thing was, even when you compared the exact same experiences, the HD DVD behaved much better. Every so often an icon appears in the top left corner of the screen, indicating a behind-the-scenes featurette about that particular scene. On the HD DVD, you click it, watch what you want to, then click Enter again to return to the point you left off in the main movie. With the Blu-ray, the system had no way of returning you to the movie; it could only dump you in the featurette menu, where you were stuck watching more of those. Sure, these problems could be Warner's programmers, and not a format issue, but Warner is going for as similar an experience on both, and it clearly can't do everything on Blu-ray that it can on HD DVD. Just have a look at the back of each disc:
As I discussed previously, Blu-ray has specifications for picture-in-picture, but to date, only one Blu-ray player that has shipped, the Panasonic DMP-BD30, will be able to handle the discs when they start making their way to stores in early 2008. Except for some rumblings from Daewoo, nobody has promised an internet-connected Blu-ray player, while all HD DVD players can. (Samsung's hybrid BD-UP5000 Duo has Ethernet, but only for HD DVD.)
