My preference when offered both is generally ePub, but for most fiction books I don't think it matters much.
Quote:
Originally Posted by Mama Zappa
I'd thought that mobi worked on the Kindle as well but Calibre seemed to insist on AZW3.
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When you say Calibre insists on AZW3 what do you mean exactly? Mobi does work on Kindle's just fine.
You could also use Kindle Previewer to convert the ePub, instead of Calibre, on the ones giving you problems and see if that makes a difference.