What is the difference between Audi's Quattro and Quattro with Ultra All-Wheel Drive?

I am looking to purchase an Audi but am unsure about the differences between their two AWD options - Quattro and Quattro with Ultra. Can anyone provide some insight?

Audi's Quattro is a permanent AWD system that evenly distributes power to all four wheels at all times, providing superior handling and traction in any condition. Quattro with Ultra, on the other hand, is a more fuel-efficient option that automatically engages the rear wheels when needed for added traction.

While both Quattro systems provide enhanced handling and grip, Quattro with Ultra is designed for smoother road conditions and may not be as effective in rugged terrain. If you plan on doing off-roading or driving in harsh weather frequently, Quattro may be the better choice.