Help with used car search, Diesel Volvo V40 / Mazda 3 or other for frequent drivers

Hello Motor-Talk friends, I have just registered here today because I am a bit at a loss. I am a freelancer and have now decided against leasing and for a good used one. I am a frequent driver up to 40Tkm per year. Therefore: fuel: diesel transmission: automatic Addition: cruise control, climate, hands-free system, Navi (opt) Currently I drive an Audi A1 95hp as a gasoline engine.. I value pleasant sitting because I often travel for a long time. until 12.00€ approx. and the car is supposed to last the next 5 years easily Three cars I have now looked closer: Mazda 3 Lim. Sports-Line cruise control climate PDC for 12T€ 111Tkm (Euro 6) Volvo V40 D3 Geartronic Kinetic for 15T€ with 65Tkm Volvo V40 CC D4 Momentum Automatic PDC 10T€ with 120Tkm (177hp), the car is however from Autohus (auto-hus with 3000 cars and there are often even more costs on it, probably then 11T€) Maybe you can help me decide or have a better suggestion for my requirements. Thank you Marcel