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Rally, the best format is the one that works best for you. However, you do want to consider longevity of the format and whether the next reader will be able to read it.
PDF is readable on almost any device and is now an open format, but, as theducks mentions, it is more of a display format and if not designed properly, it will look bad on smaller screens such as on the PP.
ePub appears to be the format that everyone is moving to and is an open format so should be around for a while.
Mobi is owned by Amazon, so it will likely be around for quite a while as well since they use it on their Kindle.
fb2 is an open format, but I don't really know how well it will do since ePub is also open and backed by Adobe. However, since it is open, you can always format shift to another format if that becomes an issue.
HTML is open, and will stay around for a long time. It can be format shifted to all the other formats easily so should be very future proof.
Txt won't have a lot of formatting, but will be readable on practically anything, and is almost future proof.
Which format is best is also determined by what is offered. Sometimes the choice is limited. However, I'd go with ePub, then mobi. I'd stay away from PDF if possible as it doesn't always display well and shifting can be a bear, depending on the original was created.
The nice thing about the PP is that it displays all these format, but each has their own quirks. Personally, I try to get ePub as it's looking to be the current format winner. It's also easy to format shift if it doesn't have DRM and relatively easy to strip of DRM.
Hope this helps!
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