What is the difference between the Audi A8 50 TDI and the Audi A8 55 TFSI?

I am considering purchasing an Audi A8, but I am unsure of the differences between the 50 TDI and the 55 TFSI models. Can someone explain the technical specifications and features that set these models apart?

The main difference between the Audi A8 50 TDI and the 55 TFSI is the engine type. The 50 TDI model is a diesel engine, while the 55 TFSI is a petrol engine. The TDI offers better fuel efficiency, while the TFSI provides a smoother and more responsive driving experience.

Aside from the engine type, the Audi A8 50 TDI and the 55 TFSI have similar performance and features. The TDI model may have slightly better torque and towing capacity, but the TFSI offers slightly faster acceleration. Ultimately, it comes down to personal preference and fuel type preferences.