Earlier quoted context omitted.
Please don't 'buy' digital items from Amazon, because you won't actually own them. Pay extra, support your local bookshop and get a physical copy which you will actually own.
This disregards the benefit of a single device that is easy to carry. Love where this is come from so maybe do both if you can.
I have a Kobo that I use to read the non-DRM ebooks I'm able to acquire. One such source is downloads from the Kobo store, when publishers make the non-DRM file available.