So many (mainly guys who race-road) think a deep wheel will cause a shift in their riding. A performance shift big enough to move results. Almost looking for a free lunch type of thinking. My point is, yes, deeper is probably more aero and therefore going to help in the speed department. I say probably because not every wheel at the same depth will be the same aerodynamically. A 50-60mm narrow V from a couple years ago is not as aero as the current wider and more rounded 50-60mm rims being produced today.
If I were buying a wheel set I’d look more at internal width, external width, hub/spokes and then depth if I wanted to chase performance. As I’ve said before, nice rolling tires and tubes are vital for performance. No sense spending money on nice wheels and roll bad tires.