Secure (family) car for 15,000 EUR – SUV? Combi? Limousine?

Hello, would you like to know which cars are the safest? I’m not talking about an assistance system, but about crash safety. Nevertheless, the (used) cars should remain affordable. How far does the weight play a role, are heavy cars safer, because less kinetic energy has to be reduced in a frontal crash? Is a heavy car partial in a crash with a tree or doesn’t it matter? Does the increased sitting position at SUVs bring something? Which cars have a particularly Big and optimal crutch zone? Would you prefer an old thick ship or a newer compact SUV? Would you prefer a mid-range car or a compact SUV? Would you prefer a very old 7-series, an old 5-series or a less old 3-series? (Analog at Audi and Mercedes…) Volvo, German manufacturer, Japanese or whatever?