If you are not finished with a document, it does not make a difference which option you choose for saving a webpage because you can edit all three types in Word.

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Saving a webpage as "Webpage, HTML only", "Webpage, complete", or "Web Archive, single file" will save it in a non-editable format that cannot be changed in Word. It is best to finish editing the document in the original program (such as a web editor or text editor) and then save it in a format that can be opened and edited in Word, such as a .docx or .rtf file.

If You Are Not Finished with a Document, It Does