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No 6″ is good for PDF, unless it extends like the communicators in 'Earth: Final Conflict'.
I did used to use KO Reader on the 10.3″ Kobo Elipsa, then I got an 8″ Kobo Sage and also Kobo upgraded to allow margin crop and then upgraded to 'save per pdf'. So I never installed KOReader on the Sage and removed it on the Elipsa. I do have it on my 7.8″ Android eink Mars, but only for epubs as the native PDF reader is as good as KOReader for PDFs and that on the reMarkable (which is a PDF tablet, not a real reader).
The Kobo Libra 2 is 7″ but the Kobo Sage 8″ (both 300 dpi) is much better for PDFs.
Kindle doesn't do epub at all. The 'Send to Kindle' of epub uses Amazon's mysterious conversion ( poorer than Calibre to azw3) and gives Amazon a copy.
Trival to install KOReader Kobo, but you might not need it. Also KOReader doesn't yet have a metadata library interface, just awkward file browser or search calibre metadata. I find it quicker to brighten scan PDFs or fix epub formatting than fiddle with KOReader settings.
All the current Kobos use the same firmware, except the Sage and Elipsa have notebooks and a Pen option. The Pen sort of works in the Libra 2 sketchpad that exports svg files.
There are 6″ Kobo also. The Nia is least good as it's not 300 dpi. The 10.3″ Elipsa / Elipsa 2 actually has less pixels than 8″ Sage, so the Sage is better for PDFs unless you need 'bigger' for eyesight.
I find any 9.7″+ size model of any kind too heavy for prolonged reading (The 9.7″ models are poor for PDF being only 150 dpi).
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