In my experience, Onyx is the best option. Solid hardware and software, with some inevitable kinks. Personally I would get a 7.8" and read in landscape. 10" would be even better for screen size, but less portable. The on-board Onyx pdf reading software is the best I've found, and crops the margins to maximize screen acreage. I owned a Boyue (Likebook). I still use the old Onyx. The Boyue I never use. Poor battery and software. The Onyx is much better at running more apps stably.
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