There are many examples of writing, and there is no template for a better product or idea . You have to think of the main thing is the product itself, and its development in stages, and just describe the product in white paper . If the product is successful, so is the project
I haven't seen any "template" that would tell us how to write a proper whitepaper but I would do a thing, download and check at least 20+ whitepapers of the top successful project and take the "honey" from them.
Compare them and take the most useful information that could lead to investor happiness and that would encourage them to invest into your product or ICO.