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.
I'm also studying for CCSP exam and I'm scheduled to take it in December. I've just finished reading the CCSP (ISC)2 Official Study Guide.
Has anybody passed the exam yet? any tips?
Last night I put together my study information for the CCSP in the following post that you might wish to review.
I am happy to say that I passed the CCSP this morning.