i use side by side. on Kindle Fire. I let amazon manage bought books directly from amazon and samples, CC manages everything else, including in some case, epub conversions of those same books which I have decided to read in mantano app instead. ( as I continue to flip over which reading app i prefer). Works for me, but I am minimalist, just one Fire & only a handful of current reading projects on the device at any one time.
if I switch to epub it is often because I don't care for the original published formatiing so by the time I have maneuvered the amazon book into calibre / sigil & tweaked it, to my liking, I will read in that format & not bother to convert back to AZW. plus it is less brain taxing to only have to remember epub = tweaked, azw = original.
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