Don't base your opinion on what Amazon tells you. Lots of us here have had ALL of these devices you're thinking about, and we know better than a huge product ad that is only trying to get you to click that buy button.
PDFs vary. I am personally reading a few on my Paperwhite 2 right now and enjoying it. However, I did have to play with some settings, take off the margins, and put a focus more on the text than the pictures.
I'm reading the bigger sized/image heavy ones on my iPad Mini.
The resolution is higher than on the Kindle Keyboard which is a few generations old now. You would enjoy it more on the Paperwhite display between the two.
But they could cram a 4K resolution in the 6" devices, and you'd still be better with the DX because of the bigger screen real estate.
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