Get a Kobo, which model depends on your needs. A Kindle is never yours since Amazon can push arbitrary updates wipe your stuff. Don't buy Boox either, as they include a lot of bloatware, not to mention they're blatantly disregarding GPL.
Kobos are mostly just arm linux machines. You can install KOReader on them for a better reading experience.
Kobos are mostly just arm linux machines. You can install KOReader on them for a better reading experience.