Both texts are excellent sources of information for the CWNA exam. I chose to use Tom's book as it is the official book for the program. I used it as my main source of material for the exam but not the only source. You will need to use other sources of information such as the whitepapers on this site and others such as the CWNPZONE. Use them and search these forums to find other material needed to pass the exam. Remember to use the CWNA Exam (PW0-100) Objectives.