Originally Posted by KoenG
Is the Xdrive capable of torque vectoring to each wheel independantly like the Audi quattro sport set-up? When it is, there is no doubt: go for Xdrive all the way, including driving fun and sheer vehicle dynamics.
There is no evidence that the Xdrive is more understeer, I believe that the center of gravity is moving a bit lower and a bit backward. Good conditions for even better dynamics!
I don't think the xDrive does torque vectoring, but the e-diff does this.
I don't understand how you mean the X-drive moves the center of gravity backwards. The center of gravity is usually between the front seats, and pretty much all the extra hardware for the AWD is located ahead of them.