What are the key differences between Audi A4 and A6?

I am considering buying a new Audi, but I am not sure which model to choose between A4 and A6. Can you explain the main technical differences between these two models and which one would be a better fit for my needs?

In terms of size, A6 is larger and offers a more spacious interior. A4, on the other hand, is more compact and easier to maneuver in city traffic.

A6 has a more powerful engine and offers better performance, while A4 has a slightly lower fuel consumption and is more budget-friendly.

Both models use the same technology for safety features and connectivity. However, A6 has some additional advanced features such as a head-up display and a top 360-degree camera.