In my limited experience, there are more books available as ePub at Overdrive libraries than Kindle. I'm not saying a lot of books aren't available as Kindle formatted, but I've borrowed a good number of books that were ePub only.
If I were buying for a friend who only used the library, I'd probably go with Kobo. That's even more true if they just want to view on the Kobo - I believe it has Overdrive integration? The friend would have to be computer savvy enough to sideload the Kindle library books.
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