Clay,
I think that likely the geometry is the big factor. A more acute angle, at least in my experience…and documented in many discussions I have read, will always reduce cutting effort. The steel, of course, determines whether that higly acute edge will be sharp for more than a slice or two.. much less hitting the cutting board with any force more than once…
🙂
Some steels just can’t support a bevel that thin!
Of course the factors are closely related…why shapen at low angles if you have to sharpen after each tomato…
Phil