Many players that use 3 notes per string, like the method because it works well with economy picking. I personally don't use the method exclusively because it pertains to an odd number, which throws off my ability to resolve at times. To compensate when I incorporate economy picking, I use hammer-on/pull-off techniques when necessary to maintain flow with the picking technique.
It is all in what your preference is. To me, either method works once you get used to incorporating it into your style.