Which is better, if I want to focus on one, pros and cons, etc...anyone have experience with both

hvac excellence
http://www.escoinst.com/Certifications.aspx
http://www.hvacexcellence.org/Certifications.aspx


nate

http://www.natex.org/


Finally I joined RSES as a student member and from what I know there courses prepare you for the Nate?