There are many, many, right answers for how to teach approaching and landing.
There's only one right answer for the speeds though - and that comes from the POH.
Personally, I find both point and power and elevator for airspeed approach teachings a little unsatisfactory because neither tell the full story. We all know that in reality both the elevator and the power must be adjusted to change either the slope or the airspeed in isolation.
I haven't worked out the perfect teaching method yet, and I don't think that anyone else has either.
Standard teaching method for PPL in the UK is that elevator controls airspeed and power controls descent rate. While these two parameters are initially decoupled in the teaching process, the student eventually gets the idea that an adjustment of one parameter will shortly require an adjustment of the other, and, with experience, will bring the two closer and closer together until they nearly coincide.
The advantage of de-coupling the two parameters this way around is that the student is less likely to get into a very low airspeed situation by pulling back to reach the runway.
Standard teaching method in the UK for advanced training (instrument approaches) is the other way around - point and power.