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Originally Posted by __
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tl;dr - Audi's thing is fwd architecture cars with awd and Quattro is more sporty than xDrive. BMW's thing is rwd, motor behind the front axle, sporty, and xDrive is more utilitarian. Subaru's thing is pretty much purely utilitarian.
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I just want to point out that Subaru is a FWD-based design. They initially sold both FWD & AWD versions, and made a purely marketing decision to sell only AWD in the US/CA.
All that is being said is ok. In theory, the Audi and Subaru systems are theoretically "better", since they never waste energy in the braking system like BMW's ADB/electronic diff. However, the amount used ("wasted") is so slight - especially where you should be off-throttle anyway - that it's a bit of a nonsensical argument. And since all systems now have DSC that "wastes" energy it doesn't matter much in any case.
There are plenty of videos out there comparing the three cars. Everyone wins.
And in the final analysis: "Having AWD/4WD just means you get stuck further into the woods/down the road."