New car with end rate or used car?

Hello people, I wanted to buy a car soon. Only I don’t know what makes more sense. 1. comes a new Seat Ibiza in question, 86 HP, climate etc. for about 13500 € – I would then pay 4000, for example, would have to pay over 24 months installments, e.g. 150 € monthly and would have a final rate of around 7000 €. The whole with about 3 % financing at Seat. 2. I buy a used Audi A3, built in 2002 with about 120.000 KM on the clock for 5000-6000 € also incl. climate etc. What would you do it? I mean – 13500 € – incl. credit it is around 14000 € – for a small but brand new car Or don’t even spend half on a beautiful Audi A3. How is that with loss of value? I saw a similar 2-3 year old Ibiza with around 20,000 KM you get used for about 10,000 – 11,000 €. Are also lost again in the 2 years 3,000 €… I don’t know quite further ! 🙂