HD-DVD
Advantages: The name itself, HD-DVD, is far more consumer-friendly than Blu-ray. HD-DVDs carry the same basic structure as current DVDs, so converting existing DVD manufacturing lines into HD-DVD lines is supposedly simple and cost effective. Memory-Tech, a leading Japanese manufacturer of optical media, stated that producing HD-DVD discs would initially cost only 10 percent more than for existing DVDs and that it could quickly bring the cost down to match that of standard DVD.
Disadvantages: HD-DVD simply can't boast the same storage capacity as Blu-ray. It's confusing, but it appears that the rewritable HD-DVD-RW will go up 32GB, while the recordable HD DVD-R discs will only be single layer (15GB). The other downside is that with Sony holding the rights to Columbia Pictures and MGM movie and television libraries, there will probably be a hole in HD-DVD's content offering--don't expect to see MGM/UA's James Bond movies on HD-DVD, for example.
Blue-ray
Advantages: Getting the early start, Blu-ray has enjoyed more mindshare than HD-DVD, as well as a conglomerate of powerful backers that rivals President Bush's "coalition of the willing" in size and scope. Technologically, the biggest edge Blu-ray appears to have over HD-DVD is that it offers 30 percent more capacity and is designed for recording high-def video. Rewritable BD-RW discs, with similar features to Panasonic's current DVD-RAM discs, can play back content while recording to the disc at the same time. Also, Sony owns Columbia Pictures and recently bought MGM, which gives it a leg up on releasing content. And PlayStation 3 certainly will carry a huge chunk of clout in the marketplace.
Disadvantages: Real or not, the biggest knock against Blu-ray is that the discs--initially, at least--will be more costly to produce than HD-DVD media (Sony claims otherwise). Until recently, the other knock was that unlike DVD-HD, the Blu-ray spec did not include support for more advanced video compression codecs such as MPEG-4 AVC and Microsoft's VC-1, in addition to the MPEG-2 codec. But the Blu-ray Group recently announced support for those codecs, so they're now on even ground on that front.
Disadvantages: Real or not, the biggest knock against Blu-ray is that the discs--initially, at least--will be more costly to produce than HD-DVD media (Sony claims otherwise). Until recently, the other knock was that unlike DVD-HD, the Blu-ray spec did not include support for more advanced video compression codecs such as MPEG-4 AVC and Microsoft's VC-1, in addition to the MPEG-2 codec. But the Blu-ray Group recently announced support for those codecs, so they're now on even ground on that front.
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