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As others previously suggested, you should just read on the reader first, both epub and kepub books, to see which you really prefer.
For myself, I'm with DNSB and prefer epub for all the reasons he stated. Kepubs always leave me with messed up text on the first and last lines with dangling letters cut off unless I want to fidget to get line height just so. I also have no interest in stats about pages read per hour or whatever else they record about your reading time. The only thing I show are the pages numbers at the bottom as "45 / 301" for example. And the miniclock in the lower right corner with remaining battery.
About covers... high resolution covers make zero sense on an ereader. The image is shown in B&W anyway, and you look at it a second or two while opening up a book (assuming you're using a sleep cover like the majority). I like the covers to be uniform in size, so I uncheck "Keep cover aspect ratio", and check "Upload B&W covers". The distortion is slight, especially for as short a time as you actually see the cover, so I just prefer them neater looking and all the same size. Either driver for epub or kepub will do that. It's not the same thing as watching a movie in the wrong aspect ratio, you'd probably be hard-pressed to tell the difference unless you compared them. Even if I didn't use a sleep cover and had the reader display the book cover while not in use, I'd still opt for not keeping aspect ratio on covers. I really dislike the sidebands that will show when a cover doesn't fill the screen. But that's me, you may prefer something different.
So just start reading and see what the differences are for yourself before you decide on either epub or kepub.
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