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Print at 300 dpi 16 shades (inc Black & White) for best 7.8" and 8" screens.
The 10.3" screens are maybe the same number of pixels. Print at 227 dpi 16 shades (inc Black & White).
i.e. 7.8" best screens are 1872 x 1404 pixels, white, 14 greys and black.
A 10.3" screen (Elipsa is maybe newest?) is ALSO 1872 x 1404 pixels, white, 14 greys and black.
Both are 4:3
The better approx €250 10" approx LCD tablets are 1920 x 1200, some are 1920 x1080. Cheaper ones are lower resolution. They often use sub-pixel addressing on black text (using red & blue edges in one direction) to increase text sharpness.
So called retina models at 10" to 13" approx actually use 2 x 2 pixels for each document or font pixel and thus turn off the sub-pixel addressing, so you don't actually have 3840 x 2400, but 1920 x 1200, or the 4:3 equivalent.
So if the PDFs are not needing colour and are not scanned pages and your eyesight (even if reading glasses needed) can read 6pt print, then the 7.8" or 8" eink may be as good as 10" 16:9 LCD or 10.3" eink. If you find 6 pt tiring then the 10.3" eink might do. But really to be sure of reading A4/Letter PDFs and decent shades/colour you need 13"+ LCD tablet with decent resolution (retina models are just extra cost), such as at least 2400 x 1560. A retina model would be 4x the 13" pixels listed.
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