Editing EPUB or AZW3 is a must. Either way, you still have to convert to MOBI, so it doesn't really make a difference from that perspective.
I suggest EPUB, since it is easier to edit. Also faster, since calibre doesn't have to unpack and repack the entire mobipocket database wrapper -- ZIP extraction/updating is faster == less loading time.
P.S. Stop updating != stop supporting. The DX is the last device to not support AZW3, and Amazon still creates MOBI for every book in their catalogue.
They *have* stopped updating the DX with new features, but it still does everything it used to do.
Not bad for a 6-year-old device.
Last edited by eschwartz; 07-24-2015 at 11:22 AM.
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