I'd say B for the overall appearance; however, you can make some luxurious color combinations on the Sport Line that you cannot with the M Sport.
I will also say that if you like driving with the windows down the base stereo doesn't get very loud to overcome all of the wind noise (sound quality is good though).
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2020 M340i xDrive, Portimao Blue
2019 X5 xDrive 40i, Mineral White
2006 S2000, Berlina Black (Track car)
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