What are the differences between Audi's Quattro and Quattro Ultra systems?

I'm trying to decide between an Audi model with Quattro and one with Quattro Ultra. Can anyone explain the main differences between these two all-wheel-drive systems and what that would mean in terms of performance and handling?

The main difference between Audi's Quattro and Quattro Ultra systems lies in their drivetrain technology. Quattro Ultra is a newer, more sophisticated system that is designed to improve fuel efficiency by engaging the rear wheels only when needed. Quattro, on the other hand, is a full-time all-wheel-drive system that provides constant power to all four wheels, resulting in better traction and stability.

In terms of performance, the Quattro Ultra system may take a bit longer to transfer power to the rear wheels compared to the Quattro system. This could potentially affect acceleration and handling in certain situations. However, it also means that Quattro Ultra can save on fuel consumption in daily driving without sacrificing too much in terms of overall performance.