Sorry, but unlike the VHS/BetaMax wars (which offered different physical characteristics), the main differences today between HD DVD and Blu-Ray are marketing.
Some studios initially offered their products in both HD DVD and Blu-Ray, even though they had aligned with the development of one or the other technology. More recently, studios are aligning their content with the technology which they had a hand in developing. And I would suggest that it's highly likely that there will be some content available in one format but not the other for the foreseeable future. (Just as there are still some music artists whose catalog is available through some clearinghouses (e.g. iTunes) but not others (e.g. the new Napster.ca).
But neither hi-def format carries "better" quality content than the other: this is purely a question of how the producers of the content have chosen to encode it within the constraints of the equipment currently available.
For example, the first few movies released in hi-def looked better on HD DVD because a better encoding was chosen, not because HD DVD was a better format. Both formats only store data; neither defines the format of that data being stored.
Many (myself included) consider BluRay to be superior because it allows multiple layers (not just two layers, although there are current limitations in the available equipment), theoretically allowing several times the 25-gig or so which can be stored on each layer.
On the other hand, HD DVD has the marketing might of Mighty Microsoft as its primary path to success.
