[eddiecalzone]

Remarkable does not have any lighting. Its use case seems to be annotating in a well-lit room.

Kindle does not support epub without conversion.

I have a Kobo Forma. Waterproof, light, great physical buttons, an 8-inch screen, 4:3 aspect (literally same as original iPad mini). Most PDFs I can read in portrait, but the rest are fine in landscape.

Kobo's native PDF support is garbage (as is Kindle's), but the koreader app makes it a joy (multiplatform, for Kobo, Kindle, Remarkable, others). It can strip the margins on the fly, is very fast, and has every config option you can think of.

Multiple ways to sideload, wired or wireless. Bonus: integrated support for syncing Pocket articles.