I have recently decided to commit to ebook for most of my books due to convenience/portability/storage of physical books. As a result, I have invested in a Paperwhite device. Most of my previous ebooks are in mobi format, which the pragprog site indicates as being the standard for Kindle.
The Amazon site here lists various others, some of which are available from pragprog (e.g. ePub). Are any of these noticeably better than mobi? I’ve got a lot of books to convert, but I am loath to spend time on this (and exhaust the pragprog gerbils) if there is no significant benefit.