I have not read the Wiley Books so I cannot provide a fair comparison. However, I would not treat the CSA document as an early piece of study material or as a replacement for the CBK. Instead, I would treat it as a final review a few days before you take the exam. I found the material within the CSA document to be a nice summation of the things I had been studying.
Everyone will have their own preferences. I found it to be useful in my preparation.
If you are looking for practice questions, ISC2 offers an official CCSP study application on both iOS and Android. CCCure also offers a nice bank of questions. For the free route, I also used the Quizlet app on iOS. Quizlet has several banks of CCSP study questions.