What is the difference between Audi A6 and Audi A4?

I am planning to buy a new luxury sedan and can't decide between the Audi A6 and the Audi A4. What are the main differences between these two models, and which one would you recommend?

The Audi A6 is the larger and more expensive sedan, while the Audi A4 is smaller and more affordable. If you are looking for a spacious and luxurious car, the A6 would be a better option. However, if you prioritize fuel efficiency and a more compact size, the A4 would be a wise choice.