Tensile = cheaper, more reliable, ALOT more people have them so they can be trusted. ALL parts replaceable. AND, if you really want a Tensile super loud you can clean it out and stretch the springs, and if i'm correct Echo SL's are welded shut. FURTHERMORE, Tensiles use a bb tool which are much more accessible and most people have one. You couldn't find a freewheel tool for an Echo SL. I win.