What is the difference between the Audi A6 45 TFSI and the 40 TDI?

I am considering purchasing a new Audi A6 and am unsure about the differences between the 45 TFSI and 40 TDI models. Can you provide some insight into how they differ and which would be a better option for me?

The main difference between the Audi A6 45 TFSI and the 40 TDI is the engine type. The 45 TFSI has a gasoline engine while the 40 TDI has a diesel engine. The TFSI engine offers higher power and performance, while the TDI engine offers better fuel efficiency and torque.