PDF isn't all that helpful on a 6" ereader of any brand. You are much better off with native mobi or epub.
Kindle and Adobe DRM books are easily read on computers, phones, tablets -- in fact, many devices with the sole exception of the vendor's own devices. Even the Nook Color, sold as is, can only read Nook epubs (which, presumably, will be Amazon's tablet model -- Kindle only); but iPad and Android tablets have apps to read Amazon, Kobo, Nook books (and Sony now has an Android app as well, I believe).
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