Your key choice is e-ink or LCD. E-ink displays use much less battery, and can be read in direct sunlight, but they flash every time the page is turned, they're mono only (so far) and they're more dark-grey & light-grey than black & white (although the newer displays have higher contrast).
Personally, I can't stand the flash when the page is turned, and I prefer a book I can carry in a shirt pocket, so my main ereader is my iPhone.
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Personally, I can't stand the flash when the page is turned, and I prefer a book I can carry in a shirt pocket, so my main ereader is my iPhone.