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

I'm researching Audi vehicles and noticed some models have Quattro while others have Quattro with ultra. Can you explain the difference between the two and which one would be best for me?

Quattro refers to Audi's all-wheel drive system that uses a mechanical torque-distributing center differential to send power to all four wheels. Quattro with ultra is a newer version that uses a predictive algorithm to determine when all-wheel drive is needed, saving fuel in everyday driving situations. If you frequently drive in slippery conditions or off-road, Quattro may be the better choice.