I don't know which certification is better, it all depends on the the person which instructs the class. In my gym there are five instructors and only one knows what it's all about (she is an athlete and biker), the rest don't have a clue. I see so many spinning students on bikes doing everything wrong, but no instructor corrects them... my opinion... there is a lack of good edu for fitness instructor in every directions...it's to easy to get the certification.

Resi