@unboogling - I find the faster way to do this is to definitely not bring them all into calibre, instead only the format version you want to keep.
If you associate the calibre ebook viewer with file extensions like epub (as well as whatever other readers you prefer configured like Microsoft Reader for LIT files etc), you can do all the comparisons in windows explorer just by double clicking on the file name. Much faster imho than importing and then deleting in calibre.
I use windows explorer search to lookup an author and/or title name in my "unsorted" folders, then just directly double-click on the search results. Once I have my preferred format to import only then do I stick it in calibre. That way you have other information visible to you like file size etc to help dictate your ordering of "likelihood" of a best version, duplicates etc. You also don't have to look at every format either.
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