I have the Kindle Voyage and 2nd generation Paperwhite. I have seen the Paperwhite 3. I would recommend the Voyage for day or night reading, not because of the higher level of brightness, but because the contrast on the Voyage is better and easier for older eyes. Because of the lighting on the screens, the Voyage may have some degree of yellow tint at the top and the Paperwhite may have smudges at the bottom but looking at the reviews for both devices, this is either not common or most people aren't bothered by it. The Voyage is a little smaller and may be more difficult to hold. I hope that your Nan loves whichever device you choose for her.
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