When leapfrogging, especially, SRT is more efficient: attach end of rope to anchor, toss bag, done. Rear guard takes care of the pull. Good division of labor/sequencing, rope keeps moving forward, etc. Generally leaves DRT in the dust (or mud). As drops get longer and more complex (ledgy, twisty, potholy, etc.) the advantage tends to increase. Exceptions can always be found, of course!