Personally I would recommend a 10.3" Onyx Boox Note Air 3 (C) or the 13.3" Boox TabX. If you really need to read and work with a lot of PDFs that were meant to be printed or viewed in A4 size, devices with at least a 10" screen (roughly equalling A5, but you can crop the margins to disply the text a bit bigger) are the best option.
Sure, the TabX is really expensive, but in the long run and in an academic/professional setting where reading is a huge part of one's job it is well worth it.
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