I publish through Amazon (azw) and my own website (mobi, epub & pdf).
Amazon accounts for about 93% of my sales, which seems to be consistent with what other indies report.
Amazon is the biggest player and as such unavoidable.
I don't like the formatting limitations of Smashwords. I might reconsider if ever they allow uploading epub-files.
I could be wrong (I probably am), but for the moment I prefer investing the energy I would have to expend to publish on and follow up several outlets on my own brand. In other words: I'd rather guide readers to either my own site or Amazon than to several others.
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