And a Forma is likely more expensive. A 5% change in screen surface area is hardly noticeable IMO. KOReader helps but bigger PDFs can still bog it down on these devices.
What absolutely killed me for using an Aura One for academic PDFs is the process of getting PDFs on and off, it's just too slow and cumbersome for reading a single article or doing research on a string of articles that you don't entirely know of in advance (as you pull articles from the bibliography of the article you just read or related articles).
I'd say skip Kobo/Kindle for PDFs, in particular academic articles. Either get a cheap Android tablet with a decent screen, an iPad or an Android eInk device like Boox or Boyue that make cloud syncing easy, have decent web browsers that can actually handle logging into a institution for paper access and can do pen markup well.
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