What is the difference between Quattro and S-Line in an Audi?

I am interested in purchasing an Audi, specifically an A4 or A6. I have noticed that some models have the Quattro badge while others have the S-Line badge. What is the difference between these two and which one would you recommend?

Quattro refers to Audi's all-wheel drive system, providing better traction and handling on various road surfaces. S-Line, on the other hand, is a design and equipment package that includes sportier exterior and interior features. Depending on your driving needs and preferences, I would recommend the Quattro for better performance and control, or the S-Line for a sleeker and more luxurious appearance.