I doubt any difference in practice. I don't have a Forma, but I have a Sage, Original H2O, Original Libra, PW3, Elipsa. All fine to read. My son's PW4 maybe slightly inferior to Original Libra, and PW3, but really it would make no difference. The Boyue Likebook Mars is also similar.
The Kobo Touch was poorer than Sony PRS-350, iRiver Cover Story, Kindle Keyboard 3, Kindle DXG, Nook Simple Touch, and Sony T1. I've had or have all of those.
I read for pleasure on the Sage.
I do proof reading & annotation on the Libra (work).
I use Elipsa for large PDFs and proofing for POD.
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