From my understanding of it after reading someone Else's views, findings from someone who owns the 2 rival formats, is that hd dvd is the better option, picture quality is better (both capable of same output) , the navigation and added features you can use on hd dvd are better than the equivalent on blu ray which are pretty poor in comparison to being able to sync the special features with main title using hd dvd picture in picture mode (it's not called that but same thing)
I would play it safe and get either or both of these.
http://www.reghardware.co.uk/2007/01/07/lg...ils_multi-blue/