Sorry, it seems you already have a reader and are asking about formats.
I thought you were asking about which device to choose.
My misunderstanding.
If you have a prs-600, the formats it reads are epub, pdf and lrf. Epub is the most commonly sold right now. Pdf is the truest to the "original" layout, but if you need to enlarge the letters this layout will be lost and the result is not always good. So I suggest you go with epub or lrf if you can.
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