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Originally Posted by Tracus

Wrong,


X1 / X2 is an "on-demand" AWD / FWD system
xDrive is a rear 40:60 (to start with) system (Front/Rear)

The FWD one powers the front wheels and let the rears trail.

The x-Drive
-> if all wheels are driving there is less chance of slip in the first place (rear always works)
-> is an enthusiast system since results in a sharper handling of a rear-drive biased car
-> the centre clutch that distributes torque front:rear is always working
-> can send 100% of the torque to either the front or the rear axles


The FWD Haldex does nothing of such sort
Front wheels receive 100% of the torque when the xDrive clutch is open, giving it a front bias instead of the usual xDrive rear bias.
No please go to RWD vs FWD debate for enthusiast driving and driving dynamics.

And one major correction: BMW is not 4WD

AWD is not the same with 4WD (four wheel drive)
AWD is a self independent system that relies on all kind of electronics and on-board nanny systems to adapt your vehicle to the slippery road consitions.
4WD is a 4X4 system that has a second stick (or electronic switch) that allows (at driver's will) the transfer case to divide the power between the front and rear axles and each wheel will spin at the same constant rate as all the others. Is an off road system.

While everything you said about how the systems differ is true, your correction of the other (right) member is not.

https://www.bmw.co.uk/discover-bmw/technology/xdrive

What is BMW xDrive?

4WD, all-wheel drive and 4x4 are all terms that are used interchangeably, but all equate to the same thing. BMW xDrive is powered by an extra layer of intelligence, making it one of the most technically advanced all-wheel drive systems in the segment.

Both of you are right, but you shouldn't say someone is wrong without learning it first.