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Do you mean vs. DVD, or HD DVD?
Blu Ray is superior in terms of storage capacity, and can deal with higher definition videos, meaning you get superior picture on an HDTV. I doubt you'll notice on an older TV though. DVD is dine, but has a lower resolution image that needs to be upscaled to look good in HD.
Which is better? Blu Ray is technically superior in every way except depth of placement of the actual data surface (A step backwards).
It's also superior to HDDVD. It holds more, etc. Both HD formats are more expensive, though, and significantly so.
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