Blu-ray is more expensive than HD DVD, has more storage capacity on discs, more security measures and initially supported more movie studios. Blu-ray also has a higher maximum bit rate for both audio and video. Blu-ray has become the most used format as of 2008.
According to HowStuffWorks, Blu-ray has considerably more storage than HD DVD with 50 gigabytes on a dual-layer disc, where HD DVD has only 30. Blu-ray discs support MPEG-2 and MPEG-4 formats in addition to the other formats on HD-DVD. Blu-ray also supports eight channels of audio sound in a variety of different formats, where HD-DVD tends to have only six channels. Another big difference between the two is that Blu-ray is more of an industry standard at the moment. When the two formats were at war, those who bought HD DVD players couldn’t play Blu-ray, and those who bought Blu-ray players weren’t able to play HD DVD discs. As the years progressed, Blu-ray began to become more and more of the industry standard. As of February 2008, one of the main companies behind HD DVD, Toshiba, decided to concede the war. Big companies like Wal-Mart, as well as Universal and Paramount, decided to use only Blu-ray.