If your reader/app supports ncx ToC then an html ToC is kinda redundant...unless you need some special formatting/decoration of the ToC that is not possible in the ncx, or, some publishing services require the HTML version.
So, if you are making books for sale then it doesn't hurt to do both. If the book is just for you, doesn't need special formatting, or doesn't require an html ToC, then it's just an extra, unnecessary sheet.
edit:
The ncx/dropdown ToC, when used correctly (h1-h6 tags indicating book structure), is better for longer ToCs because they can expand/collapse.
Last edited by Turtle91; 09-06-2021 at 09:06 AM.
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