Well this my thinking. Ephedrine is just about illegal. Ephedrine crosses the blood brain barrier very readily and attacks the central nervous system. Ephedrine makes most people pretty wired at effective doses. Effective doses diminish and you are constantly adding a higher dose. So the truth is, Ephedrine has many short comings.
You are comparing illegal drugs to legal supplements. Clen-ECA is illegal.
Creatine Ethyl Ester will help build muscle mass. But not like steroids. Steroids are illegal so comparing them is ridiculous. It's kind of like saying why take Thermorexin for energy when crystal meth works so much better.
The second reason is that Thermorexin has ingredients that do THE EXACT SAME THING that clen does and even at the same intensity so using it is just as effective as clen but you don't have to come off every 2 weeks, you get better energy for a longer time, and most people get better appetite suppression. All without attacking your central nervous system so harshly.