Which car is better – Audi A4 or Honda Civic?

I would like to buy the Audi A4 as an annual car. However, my friend is strongly against it, because we need the car almost only in the city and so the Audi swallows too much spritt. She prefers to have the new Honda Civic (http://honda.de/content/automobile/models_civic.html ). What do you mean ? I think that the Audi A4 is safer in case of accidents, after all, it also has more insertion zone at the front and so on.