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HTML will almost always be the best source format if you can get a good version. Resulting conversions should look just like they would in a browser as long as you have not used a feature not supported by the particular format. Calibre always converts any other format to HTML as an intermediate step in conversion anyway.
If using Word for the source files, then saving as Web Page (filtered) produces the best results. As to specifics of particular formats hopefully someone else will have a view.
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