I believe most main stream titles are available that can be read on the Sony and Kindle. The main difference will probably be the price you pay depending on where you will buy most of your books.
Since you live in New York, definitely look into getting a NYPL card. My understanding is it is free to all New York residents and they have a very large selection of books. Sony will read pdfs and Kindle will read mobipocket (with a slight adjustment).
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