As I said in the above comment, if you want to write a novel you can also write it on Windows notepad. The issue is, if you really want to use some tool that actually helps you, you have to see which one actually helps you, and I think if you are comparing notetaking apps, OneNote is much better for writing a book or a novel with chapters rather than Evernote because OneNote — and this is very important — allows you to arrange notes manually. You can drag them up and down which you cannot do in Evernote — this has been my biggest gripe with Evernote.
Yes, Google Docs is good because it allows you to work on your book across multiple devices. You don’t have to depend on your PC or laptop. Whenever you feel like writing, take out your tablet or smartphone and start writing in Google Docs. It’s also lighter compared to other word processors and writing apps.
Although you’re supposed to be able to work online in Office365 its interface is terrible. It is simply, humanly, not possible to work in Office365 on a tablet or a smartphone. Try it to know what I’m saying.
So, yes, I would prefer Google Docs for working on short stories, articles and essays. But when I need to do lots of research and then store that research logically and then I also create multiple chapters for a book and keep every information on every chapter related to a book in a notebook, OneNote is much better. Though, I wouldn’t claim to be sure of it because I haven’t yet written a complete book in OneNote.