The one technical advantage Blu-ray held over HD DVD is that Blu-ray discs hold more stuff, 50GB on a dual-layer disc. But that's still not enough for Metal Gear Solid 4 in all its glory, according to creator Hideo Kojima:
Kojima: For us, we're not still not satisfied with the quality we can do. You know, there's not capacity space.
Interviewer: Wait, wait a sec. Saying there's not enough capacity, are you talking about Blu-ray?
Kojima: That's correct. There's not enough space at all. [Laughs] ...There's not enough space. We always talked about where to cut and what to compress.