How does the Audi A8's Quattro system differ from other all-wheel drive systems?

I'm looking into buying a new Audi A8 and I keep hearing about the Quattro system. Can someone explain how it works and why it's better than other all-wheel drive systems?

The Quattro system uses a center differential to distribute power between the front and rear axles, allowing for torque to be continuously distributed for optimal traction and stability. As for why it's better, it ultimately comes down to the Quattro technology being extensively tested and refined over the years to provide superior grip and handling in various driving situations.