It would depend greatly on where you plan to get your books. Kindles, Nooks, and Sonys are all proprietary to one degree or another, and limit the DRM formats you can read while JB/JBL will let you read any of the major DRM formats. If you don't plan to purchase DRM'd books, the JBL (I don't know about the JB) doesn't have an internal clock or calendar, so your library books don't expire until you reconnect it to ADE. If you only plan to read non-DRM books from, for example, our own Mobileread library or purchased from such sites as Bewrite, Dulan, Smashwords, Baen, etc etc, then format availability might still be a consideration, although you can use Calibre to convert from one non-DRM format to another.
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