The 227 vs 300 depends on font.
with epub ebook at same size font or pdf at same size zoom, the PW3, Libra, Libra 2, Boyue Likebook Mars and Sage (all 300 dpi) were all sharper / clearer on fussy serif fonts than my reMarkable or Elipsa (same 227 dpi). They are also slightly better than the original Aura HD H20 (267 dpi?) which I had then too.
If you are using an old font optimised for screens rather than quality paper printing you probably won't notice the difference.
I considered a Scribe but as you say the 227 dpi to 300 dpi isn't compelling when you have two 10.3" ereaders already, and given the issues of PDF annotation, I decided not.
In the end I passed on my Elipsa and reMarkable (both too heavy & large, yet inadequate for PDFs). With good glasses the Sage (more pixels!) beats them for PDFs. I also passed on the original H2O as the Libra H2O and Libra 2 make it obsolete.
So in conclusion, for fine serif fonts for paper, or multicolumn scanned Magazine PDFs (or some text books) you will easily see the difference between 227 and 300 dpi. However if you are reading with Georgia or any font for 150 dpi to 166 dpi screens rather than for paper, you'll easily see the difference.
I think much more than 8″ is too big and heavy for novels and 10.x″ is still too small for PDFs. I now regard a 14.25″ 3:2 or 4:3 aspect screen as a minimum. The 13.x″ eink are stupidly expensive and in the past even lower than 227 dpi, but might be about that now.
I have a portable 16″ screen that's QHD (but sadly 16:9 and no internal power, it's ONLY a screen that looks like a tablet) and it's not too bad. Works on Pi or 11" Chromebook (both natively running Linux). The best all-in-one so far for PDFs is my 14.25″ Nxtpaper 14 (3:2 aspect).
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