What is the difference between the Audi A6 3.0T and 55 TFSI?

I am considering buying an Audi A6, but I am confused about the different engine options available. Can someone explain the difference between the 3.0T and 55 TFSI?

The main difference between the 3.0T and 55 TFSI engine is the type of fuel they use. The 3.0T is a gasoline engine, while the 55 TFSI is a turbocharged diesel engine.

In terms of performance, the 3.0T has a slightly higher horsepower and torque output compared to the 55 TFSI. However, the 55 TFSI offers better fuel efficiency and a more responsive driving experience.