NONE!
The movie wasn't that good and the prices for the HD DVD and bluray are insane!
I understand - combo disc - great. If the DVD side would have been a free bonus feature I would have bought it. But if the disc costs more then the usual $18 for an HD DVD. F*** it! The bluray is overpriced as well. Only $5 less for an inferior crippled version? Get out of here!
If you would put a gun on my head and you would say: "chose, or..." Well, easy choice: it would have been HD DVD. The only real next generation HD media with full features. And my PS3 cannot deliver the audio quality my E1 delivers over the optical out. HD DVD is simply more advanced. And I want real HD - not some bluray "HD light".
And then, I do not think bluray will make it over the next year. It certainly will stick around - just like the UMD for the PSP bluray will be the video format for the PS3. Sure. But mass adoption will clearly go towards HD DVD. We will see this beginning Q4 of this year. Sony will loose ALL the exclusive support in 2008 and then? How much PR tactics, lies and how much FUD can they summon? It will be over rather fast. LG already bailed. Samsung, core BDA member, is bringing an HD DVD player in this year to the market and even Denon said they are planning an HD DVD player. There goes bluray... bye, bye... sorry...
HD DVD has delivered for the lowest prices (except combo discs) the best picture quality movies (Hot Fuzz, Kong Kong...) so who cares about on paper advantages of bluray that do not translate into real life advantages. Nobody. Except some pimple ridden PS3 geeks.
One could say - "oh, but the scratch proof!" So far I have not scratched a single of my DVDs and I do not plan to start with my HD DVDs. Actually, talking about securing my investment: I know that I can still play my HD DVDs in 10 or 20 years. They are like DVDs! With my blurays... oh boy.. I HOPE I can play them 5 years before they crack due to temperature changes. Unfortunately I do not have a humidor or a wine cellar with temperature control that could avoid the cracking for maybe another 5 years...
So yeah, it would be HD DVD - if I would have to chose. But I chose not to buy it at all. Maybe when the HD DVD price comes down to $18 - then I might go for it.