It depends on which lenses you're testing, I doubt if there is law of the universe that aperture for aperture faster lenses are better or vice versa, I can't say I ever lost any sleep over the subject, speaking personally I have always bought marque Canon FD lenses with the exception of two independent ones I own, and I know they are better optics than I'm a photographer, and the same applies to the the marque lenses of the other major manufacturers, Nikon , Minolta etc.