During my many years as a PPL when I taught on single engine aircraft we always used the pitch for speed, power for rate of loss of height technique. Why should we use any other? As time progressed, ILS systems appeared on light aircraft and at more airfields. By this time I had managed to get my IR and can remember the countless times I sorted out PPLs who were trying to fly the ILS glideslope by using pitch for speed and power for rate of loss of height. Converting them to the other technique worked like magic and left them with smiles on their faces as, at last, they had conquered what they had previously considered to be the trickiest of approach manoeuvres.
P.P.