I like NASM courses better then ACE. I have the NASM Corrective Exercise Specialist certification.It was very challenging but worth it. I am considering there Nutrition certification.
I prefer NASM in almost every category of fitness education to ACE. I would recommend you do a lot of research on the subject of weight loss though. Losing weight is one thing. Changing lifestyle for sustained weight loss is another and more important. You can contact me through my profile if you are interested in discussing this more.