Well, these days, I would stand behind the CompTIA branded material. But I've always believed that two books from two different publishers is a wise way to prepare for any exam. Different authors will put information in a different perspective.
I know, even that way, I end up having to go out to other sources (the general web/YouTube/techie sites) and read/hear others' perspectives on conceptual topics. Your mileage may differ, but when I was doing CySA, I ended up reading four different books from every major publisher, just to get all the concepts in my head.