What is the main difference between Audi A2 TDI and FSI models?

I am interested in purchasing an Audi A2 and I am wondering what the main differences are between the TDI and FSI models. From a technical standpoint, what sets them apart and which one would you recommend?

The main difference between the TDI and FSI models of the Audi A2 lies in their fuel injection systems. The TDI model uses a diesel engine with direct injection, while the FSI model uses a petrol engine with direct fuel injection. Therefore, the TDI model is more fuel efficient and offers better torque, while the FSI model has better performance and power.