OBK!
So thinking back to basics, it is pitch for speed, power for vertical speed.
It's contextual in reality.
In a jet airliner it's definitely pitch to control vertical speed, power to control airspeed. (That's the way airlines train their pilots)
I believe that the US Navy also take the same view, although that's second hand info.
Bluskis
And the time when you realise you have rounded off too high, it is definitely power to control descent then.
It's power and pitch in concert really isn't? Don't you add the power which has two effects (a) an instant pitch up moment and (b) increase of airspeed, causing increased lift from the wing, both factors reducing the rate of sink, cushioning the landing.