Hello!
We used to learn and teach it the "old" way (so to say) - elevater for airspeed / power for sinkrate - till a few years ago. Simply because it is the safer way for inexperienced pilots to fly an approach: Trim the aeroplane to a safe speed and you won't stall, whatever you do with your power!
But since our school now mainly has future commercial pilots as clients who do integrated ATPL courses, we teach it the other way round from the beginning.
Greetings, Max