I've spent a lot of time comparing e-readers with colour displays to the classic black-and-white ones. Colour e-readers, like the Onyx Boox or PocketBook Color, bring illustrated books and manga to life in a way greyscale can't match. They're fantastic for anything with vibrant covers, annotations, or graphic elements. That said, black-and-white e-readers, like the Kindle Paperwhite, still dominate for pure text-based novels. The e-ink technology is easier on the eyes over long reading sessions, and the battery life is significantly better.
For reading standard novels, I find myself reaching for my black-and-white Kindle more often. The lack of colour doesn't detract from the experience, and the crisp text is perfect for immersion. However, when I'm reading something like 'The Sandman' graphic novels or 'The Complete Calvin and Hobbes,' a colour e-reader is a game-changer. The trade-off comes down to content—colour wins for visuals, but black-and-white remains king for marathon reading sessions.