What is the difference between Quattro all-wheel drive systems in Audi vehicles?

I'm trying to decide between two Audi models and they have different Quattro all-wheel drive systems. Can anyone explain the differences and how they impact the driving experience?

The main difference between the Quattro all-wheel drive systems in Audi vehicles is the placement of the differential. The standard Quattro system has a mechanical center differential, while the Quattro Ultra system has an electronically-controlled clutch pack at the rear axle. In general, the Quattro Ultra system is more efficient and allows for better handling in various conditions.

One key difference between the Quattro all-wheel drive systems is their level of customization. The Quattro Ultra system can adjust the power distribution between the front and rear wheels based on current driving conditions, while the standard Quattro system has a fixed 40:60 front-rear power split. This means the Quattro Ultra system can provide better traction in specific situations.