What is the difference between quattro ultra and quattro on-demand in the Audi A7?

I am looking to purchase an Audi A7 and I am not sure what the difference is between the 'quattro ultra' and 'quattro on-demand' options. Can someone explain the technical differences and which one would be better for daily driving?

The Audi A7 with quattro ultra features an ultra-advanced all-wheel drive system that is engineered to provide optimal traction and stability in all driving conditions. It is designed for smooth handling and improved fuel efficiency without sacrificing performance. On the other hand, the Audi A7 with quattro on-demand offers a more traditional all-wheel drive system that engages the rear wheels only when needed, and prioritizes front-wheel drive for better fuel economy. For daily driving, the quattro ultra would be a great choice for its seamless and efficient operation.