What are the main differences between an Audi A4 and A6?

I'm trying to decide between these two Audi models and want to know what sets them apart from each other. Which one would you recommend and why?

The Audi A4 is a smaller and more affordable option compared to the A6. The A4 also tends to have better fuel efficiency and handling, making it a great choice for city driving. On the other hand, the A6 offers a more spacious interior and a more powerful engine, making it ideal for long trips and highway driving.

Both the Audi A4 and A6 have excellent safety features and advanced technology, but the A6 takes it a step further with its comprehensive driver assistance systems. The A6 also has a higher starting price, so consider your budget and priorities when choosing between these two models.