I'd go eInk. The DPI difference will make a HUGE imact on text quality. In the normal orientation for reading with the Pixel Qi, you get no additional pixels, since it is still 600 regardless of mode, so not really 300 DPI. Also, as someone who has followed alternate display tech for a long time, displays have come a long way in the 10 years since Pixel Qi went out of business. Hell, even at the time, for text rendering, I'd place older eInk over Pixel Qi.
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