The Kobo has a much lighter screen. So less contrast. Sony & Kindle 3 have the best e-ink screens, Nook, and then Kobo. Not sure about how many Sony models have the new e-ink pearl screens, but I know they do.
With the nook, it can read books from any store almost. (not including Amazon.com since they use their own proprietary format, .azw, for books). If you can install Amazon's ebook store app that is for Android phones, you might be able to buy and read books from amazon. I am not quite sure if that is possible though.
I have not owned a Kobo and have not looked into it too much to know how many places you can buy books from.
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