So, as I understand it, e-ink screens are all made by the same company and sold to the various ereader companies. As such, they are basically comparable. At least this was the case two years ago when I was looking into it.

Yeah…I did a lot a research before landing on Boox, and it 100% is the best. Pricey tho.

Did this for my dad a year ago, got him a Boox and set up calibre. Between libraries and drm free sources Ive got him almost completely off of amazon.