This is confusing... Are we sure, the information from GoodEReader is correct?
It kind of does not make a lot of sense, that Onyx would release a reader with an older CFA based color display technology, while Pocketbook and other chinese brands are using the newer, improved ACeP displays.
By the way, E-Ink has a nice overview of the different display technologies on their website:
->
https://www.eink.com/color-technology.html
->
https://www.eink.com/electronic-ink.html