From another forum
llahsram said:
Given the same quality decoding hardware, for most movies they shouldn't see any difference at all. Both support the same codecs (MPEG-2, h.264, and VC-1). The first Blu-Ray discs were encoded using MPEG-2, which produced a lower quality image than the VC-1-encoded HD-DVD discs, but newer Blu-Ray discs are using VC-1 as well. The picture should be identical between the two.
The only case I could see where the capacity would affect it would be for longer movies like Lord of the Rings, where the encoded video plus lossless audio may reach the boundaries of HD-DVD. We could conceivably see more compression artifacts or the dropping of higher-resolution audio or commentaries on HD-DVD in these cases, whereas Blu-Ray would have more space. But this shouldn't affect most titles.
Doesn't matter if they are now using the same codec. People's displays are messed up (component vs HDMI, version of HDMI, is the resolution REALLY 1080p?) as well as the players. As far as I'm concerned, the whole thing's messed up....
I posted this in this forum:
https://forums.macrumors.com/threads/236514/
"Wow, I went online to see the pros and cons of each format. When someone posts a pro/con of one system, they post the rebuttle of it on the other....
Like, I heard that Blu-Ray only has MPEG-2 right now, but it is capable of MPEG-4 and studios backing both formats will start releasing Bluray in MPEG-4 since they have to encode the movie in that for HD-DVD anyways.... what about the current Bluray titles?
I heard that Sony does have the dual layer Blurays available, and hybrid DVD/BD available also...
I saw a post of a guy online who actually hooked up his Samsung to a massive HP 60"(?) monitor that actually takes 1080p/24 scan signal (I guess a lot of TVs will take only 1080i and will upscale it to 1080p inside the TV) and he says Bluray is great! Do people actually have this sort of monitor?
Then, there's this whole 1080p/24 discs and if you want 1080p/60 Bluray has to take 1080p/24 go to 1080i/60 then to 1080p/60... what?
Then, I heard that the HD-DVD players if you have a 720p set that the player will take a 1080i disc, down it to 480p, then up it to 720p. They recommend to make the player output 1080i and have your set take it down to 720p (which my projector won't do, it just takes any signal you give it and shows that).
Wow, I'm now sooooo confused, I'm going to watch my Laserdiscs and Betamax for a while....."