The only and unique advantage of a Kindle over any other device for non-Amazon purchased books is...
... It is the only and unique application that is able to synchronize the reading position across devices and across platforms without issues. Even with low quality WiFi.
Any other application that will offer synchronization, sooner than later, will fail to sync.
Why I can say this in so categorical manner? Because I've used all and all have failed to me... except Kindle in all of their devices (say, Windows, macOS, Android, iOS, and Kindle devices). Well, Windows and macOS only for purchased ones.
Ask for an application/device with synchronization and I will tell you with how many frequency it fails to synchronize.
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