What is the difference between Quattro and Quattro with ultra technology in Audi vehicles?

I'm looking to purchase an Audi car and I'm confused about the different types of Quattro drive systems available. Can someone explain the difference between Quattro and Quattro with ultra technology and which one would be better for my needs?

Quattro is Audi's all-wheel drive system that powers all four wheels at all times, providing better traction and handling on various road conditions. Quattro with ultra technology is a more advanced system that can switch between front-wheel and all-wheel drive, depending on the driving conditions. It offers improved fuel efficiency without sacrificing performance.

I have been using Audi cars for many years and my personal experience is that Quattro with ultra technology is the way to go. It provides the best of both worlds, giving you the grip and stability of all-wheel drive when needed, while also reducing fuel consumption when driving on smooth roads.