I'm a fan of Coolreader.
Why?
1) Historical reasons, in the beginning it was superior to KoReader.
2) KoReader still has problems with my PB Touch HD.
3) Adapting it to my needs took days, didn't wan't to switch after everything worked.
With other words, try KoReader first, now it has more features, adapting Coolreader will take longer.
BUT booth are working only with hard-DRM-fee books. For books crippled with hard-DRM there is no way around the internal reader without liberating what you bought.
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