I read on this forum that epub and AZW3 both support more advanced layout (etc.) options than the mobi format. Also, from my observations, epubs and AZW3 display almost (if not completely) identical. In this case, that means :
epub & AZW3 > mobi
epub --> mobi = mobi quality
mobi --> epub = mobi quality
epub --> AZW3 = epub/AZW3 (same) quality
epub --> mobi --> AZW3 = mobi quality
Again, this is just based on observations, no actual scientific-ish testing.
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