In my personal opinion these two display technologies are roughly comparable; neither is perfect and each has advantages the other lacks. E-Ink provides better battery life and wider viewing angles, reflective LCD provides a faster refresh and somewhat better contrast (though its contrast advantage can be offset by the limitations in viewing angle).
The end result is that different people will have valid reasons for preferring either.
However, there is one point that a poll like this is missing: People don't simply read ebooks from bare screens floating in mid-air, they read ebooks from screens that are built in to devices.
Currently, as a class, reflective LCD devices are most often aimed at the lower end of the market. The higher end devices rely primarily on E-Ink. This means that unless you are someone to whom the advantages of reflective LCD make a big difference, E-Ink will often be a better choice because it is more likely to come in a better device.
Either screen will work - the real question everyone needs to ask is which device best fits their individual needs at a price point they are willing or able to pay. The answer to this question is not going to be the same for everyone.
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