I only have the DD, and use it with a spot helmet light.
On it’s own I find the DD is really bright and plenty wide enough, but lacks a bit of forward penetration, hence the spotty lid light. I think to myself that it would be good if one of the three lenses could be a spot with the others left as flood.
If anything the DD is too bright on max, and tends to wash out the trail a bit. Doesn’t stop me turning the wick up on faster downhills though.
No idea how it compares to the LL, but it sounds like they might be too samey. and you would be better off with helmet spot light.