Use whatever tool allows you to sit down and write content sooner. If you don't know Latex, don't waste time learning it (unless the book has a lot of formulas

Use whatever tool allows you to sit down and write content sooner. If you don't know Latex, don't waste time learning it (unless the book has a lot of formulas in it). So if you already know how to use Word, (or similar word processors like the Libreoffice one) use that. They are perfectly fine for large text base stuff. If you have plenty of images it will get heavy, but I think there might be a way to link to external files?). Rendering in PDF from MS Word works very well. If you need to share it with somebody for review and comments, most people would be able to open it and read it and comment directly on it. And the WYSIWIG aspect of it should not be underestimated. The amount of personalization of fonts, spaces, etc, is way larger than other options.