The Gregorys for a single model. In the same amount of pages Gregorys did the VS V6, Haynes did every variant of VN-VS with all 3 engines. I know there's a lot of overlap but they've got to have cut a decent amount of stuff to get it to fit into a book like that.
Also worth trying to find PDF factory manuals. The ones for the VT are easy enough to get, unsure about VN-VS at this stage.