My choice is epub. Or mobi/azw3, if it is the original format the file came to me. I prefer epub, mainly because it is possible to edit in Sigil without any further conversion.
Just before sending to device, an extra step of conversion is needed, but I can live with this one. Then, usually, the mobi/azw3 file is removed from the library.
Please, point me out, if there is something wrong or a better way.
Thanks!
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