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I think it's a bit of a trade-off with convex mirrors. They give a wider field of view but distort distance, so if you're relying on the image in the mirror to estimate the distance of following traffic you're going to come up a bit shorter than you think.
As far as aspherical mirrors, that's a bit ambiguous. Aspherical simply means "not spherical" so I guess you're referring to a convex mirror with a variable radius. That would provide a variable ratio field of view with a variable distortion in distance and has the potential for being quite confusing.
Personally I'm an old fart that likes flat mirrors.
Jim
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