A2 vs A3 - Which one is right for me?

I've been doing some research and considering purchasing a new Audi, but I'm torn between the A2 and A3 models. Both cars have their pros and cons, but I'm struggling to determine which one is best suited for my needs. I'd love to hear from other Audi enthusiasts who may have experience with either model - what are the key differences that I should be aware of?