What is the difference between the Audi A8's FSI and TSI engines?

I am looking into buying an Audi A8 but I am unsure of the engine options. Can someone explain the difference between the FSI and TSI engines and which one would be best for me?

The FSI engine uses direct fuel injection while the TSI engine uses both direct and indirect fuel injection. This results in a more efficient and powerful performance for the TSI engine. Personally, I would go with the TSI engine as it offers a better balance of power and efficiency.

The FSI and TSI engines differ in the way they deliver fuel to the engine. TSI engines have a smaller displacement but with the aid of a turbocharger, it can produce more power than an FSI engine. If you want a more powerful engine, go for the TSI.