Basically there are 3 formats in use (disregarding PDF...)
1. ePUB
2. mobi
3. FB2
The FB2 is mostly used in Russia and other Cyrillic countries, or so I have been old. The ePUB is used all over the world, so also outside the US.... Mobi (aka Kindle) is mostly US and UK based. Perhaps if you only consider English native countries, the Kindle is dominant. I am not convinced, but it could be. However, the US (and UK) is not the complete world (although some like to think so). Even so, how many buy a book at Amazon to immediately convert it to ePUB?
Main problem is the lack of figures, partly to blame geo-restriction. As long as not *all* online stores across the world publish their figures, it is very hard to say which format is dominant. Also, geo-restrictions holds back spreading of ePub.
I will not participate in a discussion which format is better. I have read enough about it and I have my opinion, but that is not relevant.
However, as soon as Amazon/Kindle would support ePub, global domination would be theirs I am afraid.
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