Good comparison, Meywd!
To me, the DualISO with ML renders the best shot here.
In the "regular" HDR I see a slight tint of green, that, to me, doesn't look natural, judging from the surrounding colours of the mountainsides. Also the hint of halo at the cliff-to-sky transitions seems like effects I also tend to get from some tools I've used for HDR processing. Both versions have great skies - my experience is that it is easy to get greyish sky, without much depth and tone, while doing regular HDR.
Not out to criticise your processing of the shots, we all see things differently and have varying tastes, but the various methods does deliver different results. The choice to make is: Can I get what I need from one shot only, or do I need a bracketed series? I haven't done DualISOs myself (can't process the resulting DNG files), so I can only imagine what the time differences would be between waiting for the tool to render the DNG file from the dualed CR2, compared to the processing time with bracketed shots in a HDR tool.
Btw: Has anyone tried to make a bracketed series of DualISOs, and then processed those to a HDR? I would assume that with the right treatment one should be able to squeeze out a little more from such an attempt.