One other point I would like to add to this
preference debate are DVD authoring issues/errors.
Here is analysis of
Blade II DD vs dts audio and the audio mixes appear to be pretty close to identical, yet the DD audio appears to have an "edge" due to DialNorm compensation. Contrast this with the referenced U-571 dts audio error where the LFE channel had a 4db volume boost over the DD audio which means the dts audio will be more deep bass, not because of dts itself but because the LFE volume was increased a bit.
Maybe DD and dts are really closer than we want to admit.
Peace...