Kindle Paperwhite, hands down. I love the covers made by a company called Fintie. Lots of nice designs, inexpensive, and they let you hold the kindle like a book if you want. For travel (i.e. if you are sitting on a plane or in a restaurant) you can fold the cover back and put the Kindle in a stand (also by Fintie) so you don't have to hold it. (I have arthritis in my wrists and fingers so this makes it more comfortable to read for long periods.)
These are the covers:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
This is the stand that I have:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
kathy