Positional resolution is better in epub than in mobi, both horizontally and vertically.
"yes, but how do you position things with reflow in mind?"
"by using relative metrics instead of absolute."
Also, Kindles come with 1 font. epub allows embedding of fonts, for those who like that sort of thing.
And, tho not currently not well defined (and therefore not yet implemented/implementable), epub will eventually allow for multimedia, like sound, animation, movies, smellavision, etc. Mobi's development is basically dead-ended, so what you can currently do is all you'll probably be able to do.
-b
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