Embed Metadata will do the same thing that Send-to-Device does, but instead of updating the copy on the ereader, Embed Metadata updates the in-library copy.
Polish Books is more powerful than Embed Metadata, since it can also create a cover when the ebook doesn't yet have one.
It also does several things in addition to embedding the metadata (e.g. book jacket, font subsetting, etc.)
Polish Books works on EPUB/AZW3 only, Embed Metadata supports all ebook formats just like Send-to-Device does. However, not all formats support all metadata. For example, MOBI does not support cover images, therefore you can only update the cover by reconverting.
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