What are the main differences between the Audi A8 and A7 models?

I am considering purchasing an Audi A8 or A7, but I am unsure of the specific differences between these two models. Can someone explain the main distinctions in terms of performance, features, and design?

The A8 is larger and more powerful than the A7, with a longer wheelbase and a stronger engine. The A7, on the other hand, has a sleeker design and more advanced technology features.

The A8 has a more luxurious and spacious interior compared to the A7. However, the A7 offers a sportier driving experience and more fuel efficiency.