I have the Paperwhite 3 and the Paperwhite 4. I'm not sure I have much preference for one over the other. I do prefer the raised bezel of the Paperwhite 3. It makes it a bit easier to hold it without accidentally turning a page. But that's a very small difference. I like them about equally well.
I haven't seen an Oasis so I can't really comment on that. I'm not tempted by the larger screen. If anything I'd prefer a smaller screen.
Barry
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