Friction that is commonly measured in these self-ligating studies trying to support their superiority is usually a first order friction (force of an elastic on top of the wire) rather than a second order (binding at the corners of the brackets). For orthodontic purposes, the binding is the important factor, and this has not been studied by proponents of self-ligating brackets.
You might wish to read both of the arguments and make your own decision.
http://journals.elsevierhealth.com/periodicals/ymod/article/PIIS0889540612010256/fulltext
http://journals.elsevierhealth.com/periodicals/ymod/article/PIIS0889540612010268/fulltext
Our office wants to use the best treatment options for our patients and we are at the forefront of modern orthodontics, but as orthodontics is a science, we do need to rely on the strongest evidence when deciding on which options to offer.