What are the differences between Audi A1 and A3 models?

I am considering purchasing an Audi and am trying to decide between the A1 and A3 models. Can someone explain the key differences in terms of performance, features, and pricing? Thank you!

The Audi A1 is a compact car, while the A3 is considered a small family car. This means the A3 has a bit more space and a higher price point, but also offers better performance and features.

One of the main differences between the A1 and A3 is the engine options. The A1 comes with a choice of three petrol and two diesel engines, while the A3 offers six different engine options, including plug-in hybrids.