What is the difference between the Audi A1 and the A3?

I am considering purchasing either the Audi A1 or the A3, but I am not sure which one would be the better option. Can you explain the main differences between these two models?

There are several key differences between the Audi A1 and A3. Firstly, the A3 is a larger and more luxurious option compared to the A1, which is smaller and more affordable. Additionally, the A3 offers a wider range of engine options and more advanced technology features. However, the A1 may be a better choice if fuel efficiency and compact size are important to you.