I tried out KOReader quite recently (for the first time in many years). FWIW, I couldn't see any point in transferring any books in kepub format unless I also wanted to retain the option to switch between KOReader and stock reading apps on a whim.
As an aside, in the end I decided not to move to KOReader for now. I was very impressed by its great handling of CSS font-variant:small-caps; but put off by its apparent inability to handle font-family:sans-serif;
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