Sony's touch screen optionally uses an included stylus, which I assume would also work on the Nook and Kobo screens, which use the same IR technology. Kind of old fashioned perhaps but very flexible and familiar. For the fingerprint-phobic, and others besides.
(Note that of these 3, only Sony seems to allow annotation, unless you consider bookmarks 'annotation'. I don't use this feature on Kindle much, but I would not be without it.)
I just want enough buttons to navigate to a book, open and turn pages. Thus Nook would work, Kobo would not. Beyond that, I'm happy to touch the screen (or use a stylus) to get to everything else. An option to tether a Bluetooth keyboard/trackpad might be nice for more specialized usage.
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