What are the differences between the Audi A8's Quattro and Quattro with Ultra Technology?

I'm looking to purchase an Audi A8 and have seen two options for the Quattro drivetrain. Can someone explain the differences and which one would be a better choice for daily driving?

The Quattro with Ultra Technology is a newer and more advanced version of Audi's legendary all-wheel drive system. It uses sensors and predictive software to distribute power between the front and rear axles, providing better traction and handling. It also has the ability to disengage the rear wheels for improved fuel efficiency during highway driving.

The traditional Quattro system uses a mechanical center differential to evenly distribute power between the front and rear axles. It is a proven and reliable system, but may not offer the same level of fuel efficiency as the Ultra Technology.

For daily driving, either option would be suitable. The Quattro with Ultra Technology may provide slightly better fuel efficiency, but the traditional Quattro system may appeal to those who prefer a more mechanical and traditional approach to all-wheel drive. Ultimately, it may come down to personal preference and budget.