I bought both, the Wiley in paperback and SS in ebook format. The Wiley 11th HG is 300 pages, SS is more condensed at about 200 pages. They both cover the basics but interestingly sometimes highlight different aspects of the readings or offer different ways to think about/approach the same material. I used Schweser study materials for Level I, and opted for Wiley for Level II. I’m enjoying the Wiley Guide a bit more, if only because I like writing in the book, but SS provides some nice pointers that weren’t mentioned in the Wiley study guides.