The best color E Ink reader I've tested is not made by Boox or Kobo
Briefly

The Kindle Colorsoft is a groundbreaking addition to the e-reader market, combining vivid color display capabilities with impressive performance, brightness and user-friendly features.
With a 300 ppi standard for e-readers and an additional 150 ppi display for color images, the Colorsoft promises a richer reading experience with customizable color settings.
The Colorsoft's super-fast performance makes navigating the Kindle library refreshing, eliminating annoying lag effects commonly associated with older models.
Bright enough for direct sunlight reading, the Colorsoft's impressive 120 nits of brightness surpassed competitors, proving to be a top choice for outdoor readers.
Read at ZDNET
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