What is the difference between a diesel and petrol engine in an Audi vehicle?

I am considering buying an Audi vehicle but I am unsure of which engine option to choose. Can you explain the difference between a diesel and petrol engine in Audi vehicles and which one would be better for me?

Audi vehicles with diesel engines offer better fuel efficiency and torque, making them ideal for long distance driving and towing. However, if you mostly drive in city areas, a petrol engine may be a better choice for its smoothness and responsiveness.

Diesel engines tend to be more expensive to maintain and repair compared to petrol engines, so if you are on a tight budget, a petrol engine may be the wiser option.