What are the main differences between the Audi A8 55 TFSI and the A8 60 TFSI?

I am considering buying either the Audi A8 55 TFSI or the A8 60 TFSI, but I am not sure which one would be a better fit for me. Can you explain the key distinctions between the two models?

The main difference between the Audi A8 55 TFSI and the A8 60 TFSI is the engine. The A8 55 TFSI comes with a 3.0-liter turbocharged V6 engine, while the A8 60 TFSI has a 4.0-liter twin-turbocharged V8 engine. The A8 60 TFSI also has an increased horsepower and torque, resulting in a more powerful and responsive driving experience.