I haven't even tried the DD. Can you elaborate on what you are hearing?
i was just looking through the waveforms, there's scant difference between them when ripped (LFE appears a bit raised on the DD).
maybe there's some Dialog Normalization codswallop going on upon playback of either of the codec streams that's causing any perceived differences idk but the Flac rips i have of both DTS & DD don't sound markedly different from one another, in fact flicking back and forth they sounded so similar as to be the same (both bright and kinda earache-inducing).