Just as one can break DRM and convert EPUB to MOBI, one can break DRM and convert MOBI to EPUB. Thus arguments about which e-store is bigger and offers more books is irrelevant (assuming one is willing to break DRM and convert).
I myself have a Sony. I've purchased books from Sony, Barnes and Noble, Amazon, Fictionwise, Borders, Smashwords, and a couple independent publishers.
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