That's the whole problem. Unless a direct comparison is set up such as the one I was involved in, there are no ways to directly compare DD to DTS with known controls on how each was processed. The only reason this one existed is so that a decision could be made on release format of a film by the producers involved. It is unlikely that you will ever get DD and DTS in the same room again to do this type of comparison, and having both formats on the same consumer disc are useless for comparisons.