They use the same codecs, so video quality should be basically the same, assuming a good transfer. Comparing the better titles from each, in terms of straight video, the two look identical to me. Audio wise, they also both support the same audio formats, though it seems releases for certain discs have been putting better audio tracks on the HD-DVD (the studios). Feature wise, they appear to be very close too. I like the fact that I can jump to trailers or behind the scenes stuff mid movie and then it automatically goes back to where I was in the film. I also like that you can pop up the various menus without stopping the movie (scene selections, audio/alternate audio selections, etc..).