I agree with the others: if you've got space, why not keep them all? There's nothing wrong with switching between them, if it's not making you unhappy, and you don't have a particularly urgent need to get rid of them. If anything, it means that if one dies, you'll be used to using the other two.
Hypothetically speaking, I would keep the Paperwhite and Libra 2, if I was cutting down from those three: the paperwhite for when I wanted to have something a bit more portable/"book shaped", and the Libra 2 for when I wanted to use buttons. If I was going down to one alone, I'd keep the Libra 2, but that's just personal preference at that point, nothing objective.
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