Well what has to be mentioned is that the standard layout of power on the xDrive is 40:60! This can change depending on conditions to 100:100! The driving mode can be set to SportPlus which onlocks 30:70 distribution and keeps it that way.
When comparing steering, I really do not recall any noticable differences other than that bite that my xDrive has, basically eating asphalt with the will to accelerate, whereas the sDrive starts to drift in EVERY corner or curve if that right foot isn't carefull.
Both cars have the "sport steering option" stiffening with high speed and easing parking manouvers.
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