Like the legendary (if lopsided) battle between VHS and Betamax, Blu-ray and HD DVD are each striving to win the next format war. It's too early to declare a winner, but we can tell you the key differences.
Our sister site Yahoo! Tech explains that HD DVD and Blu-ray are different high-definition DVD formats. Both offer huge visual improvements over the current generation of DVDs and both are getting a lot of press, due in part to video game consoles. The Xbox 360 will eventually support HD DVD and the PlayStation 3 supports Blu-ray. But if you don't play video games, choosing which horse to back becomes a bit tougher.
More large companies (and studios) currently support Blu-ray than HD DVD, but that's only one aspect of the war (and one that's debatable). HD DVD players are generally less expensive than Blu-ray players, and while Blu-ray is believed to be technically superior to HD-DVD (each disc holds more data), its higher price may cause consumers to overlook its specs.