I own both, and honestly I cannot tell the difference. But HDDVD does load ALOT faster. But video quality is the exact same at 1080p I cannot see the difference. Personally I would prefer HD-DVD to win, cuz Sony has that whole Shitty "I am Sony" attitude.

Just my 2cents (actually a $499 PS3 and a $199.00 Xbox360 HD-DVD player) LOL

But the HD-DVD player does upsample regular DVD much better.