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I read both ePubs sideloaded via Calibre and KePubs synced from Kobo. Although the KEPUB reader has improved in the last few firmware releases, I still prefer ePubs. The main reasons are:
* Automatic hyphenation works better in ePubs. Although hyphenation improved for KePubs in recent firmware, there are still some problems remaining.
* Full justification works better in ePubs. The KEPUB reader still has an annoying problem where the text is not always properly justified when the line contains words connected by certain non-ascii characters such as em-dashes and ellipses.
* The EPUB reader allows narrower line spacing. The KEPUB reader has a bug that causes part of the top line of text to appear at the bottom of the previous page if the line spacing is set too narrow. (Although most users won't see this problem, as it is usually necessary to edit the book's stylesheet or use a firmware patch to get the line spacing narrow enough to trigger the problem.)
* The EPUB reader supports ligatures in fonts that have them, the KEPUB reader doesn't. In general the EPUB reader seems to have better font support than the KEPUB reader, as all of the fonts I use work with the EPUB reader, while some don't work properly with the KEPUB reader. (Even the OpenDyslexic font that comes with the device works fine with the EPUB reader but not with the KEPUB reader.)
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