What are the main differences between Audi A1 and A3?

I am considering buying an Audi car and I am confused between the A1 and A3 models. Can anyone help me understand the key differences between the two?

The Audi A1 is a subcompact car, while the A3 is classified as a compact car. This means that the A3 is slightly larger and more spacious than the A1.

The A1 is designed for urban driving with its compact size and nimble handling, while the A3 is better suited for longer trips and highway driving.

In terms of engine options, the A1 offers a wide range of efficient petrol and diesel engines, while the A3 gives you more power with its available turbocharged engines.