As a guy who has had both of these cars for couple years I would suggest you to go for M6 PERIOD.
It's not just about the power and torque of this monster or race track since M6 specially convertible is too have and big for track, but the sporty character of M6 beside the amazing DCT, Active M differential, sporty suspension and more aggressive look (compare to 650i) are the factors you will enjoy with M6...
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Current : 2020 F92 Black Sapphire M8 - ZF8
Gone : 2018 F80 Mineral Gray M3 - 6MT
Gone : 2016 F82 Austin Yellow M4 - 6MT
Gone : 2013 F13 Sakhir Orange M6 -7DCT
Gone: 2013 F13 Alpine White 650i -ZF8
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