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I'll only add one post to this tired debate.
When all things are equal and the same masters are used for both tracks, the differences between DTS and DD are negligible at best, even indistinguishable. Sometimes the DTS track is better, sometimes the DD track is better. But it rarely if ever comes down to bitrate. The bitrate argument is completely useless and is not proof that DTS is better. In fact, DD is a more efficient compression. Not only that, DD is downmixed more often than not. Also take into account that DTS tracks tend to be a couple of decibels louder than the corresponding DD track.
So the only way to compare the two fairly and equally is to participate is matched, double-blind listening tests using the exact same setup for both tracks. In all the tests like this that I've read, the results are inconclusive. They could tell which was which with any reasonable degree of accuracy. Often they chose DTS as the better track. Other times they chose DD as the better of the two.
Either way, people tend to get caught up in all this marketing jargon. Just be happy that sound is as good as it is.
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