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For Amazon KDP it's best to upload an epub2. They make it into old mobi, azw/kf8 and KFX with Enhanced Typesetting. This was Amazon's advice.
Unless you are making a text book or comic, it's best to work in Word or LO Writer, do a final save as docx and convert to epub2 in Calibre. Then convert epub2 to dual mobi for Smashwords only.
If you are more into layout design than writing, then you might use Sigil, InDesign (expensive), Calibre's editor etc. I can't see the point of KindleGen for anything like a novel or short story.
IMO a dual mobi has only two uses: Either to upload to Smashwords for their own Kindle downloads (also upload an epub2 as that's distributed), or to give a PD or your own text to someone with a Kindle and you don't know if it's older FW/model.
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