I do not think you can go wrong with either. I have my CES through NASM and thought it was an excellent and thorough program. I did not find it to be centered about weight loss or performance enhancement, I thought it was geared to every day people with imbalances and/or chronic pain. That said I have viewed many continuing ed videos by Justin Price and agree with Jeremy, that his methods are sound and easy to understand. I would weigh price and convenience to help you decide.