I'm happy with my Kobo Clara Colour. As far as the specs go, both are 300 PPI when displaying black and white. I took a picture of my screen from as close as my phone would allow - the lens was basically touching the e-reader [1]. My eyes can't really focus at this distance anyway, so I can't complain. I don't use the colour screen much, but seeing the book covers in colour is fun for me.

[1] https://imgur.com/a/cszqi0F