One thing I always miss in these discussions, that I think matters as much as the angle of cut, is the way the stroke helps to keep the razor in close contact with the face as we move it over the contours of the face.

I use a kind of rotational stroke sometimes not because the math of the cut is better, but it seems the most effective way to handle that part of my face.

No stroke, however efficient at cutting, will shave well if the faces contours interfere with the edge's contact with the skin.