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Agreed SG75s are plenty stiff and fine most of the time. I'm only about 73 kg, but do notice flex from standing starts.
Never owned or ridden Rotors but I don't like the way they look; form over function, angles, edges and unnecessary milling. They're probably lovely cranks, though. I imagine it can't be as aero as the Miche because the transition from spider to/from arm isn't as smooth.
For a square taper crank I always found my S75's to be pretty stiff and solid. But I'm no 80Kg sprinter type, maybe that makes a difference. Given how hard it is for square taper crnaksets to compete against (most of the) modern thru-axle designs they do quite nice.
But it's true that the the 75DD's are not so tempting. They always looked like an unwanted child, born just because the marked demanded something with outboard bb.
btw @umop3pisdn what do you mean by "agricultural"? :D