I do most of my reading on a Kindle Paperwhite. I'm currently reading the Penguin Classics translation of The Count of Monte Cristo (much better than the Project Gutenberg version I read years ago) and the Kindle's X-Ray feature, which lets me find out about the many characters and their relatives who pop in and out of the novel, helps me remember what the hell is going on. The Kindle is also a lot easier to hold than the 1200 page paperback version, which my daughter is reading.
The Paperwhite rarely needs recharging, even when the backlight. Unlike a phone or tablet, there's no glare, making it the best way to read outdoors. I have at least a hundred books on it, and haven't gotten a "memory almost full" warning (text doesn't use a lot of storage, like audiobooks do). If I don't have my reading glasses, I can make the text as large as I need to.