The safest second vehicle for the family

Due to a tragic traffic accident in the kinship, we want to exchange our 11-year-old polo. I’m primarily concerned with finding a safe car for our offspring (4+2 years). The vehicle should be used as a second vehicle especially for short distance: Here our previous thoughts/improvements compared to the old polo: VW Touran: ABS, ESP, airbags, large knautschzone Roomster: already smaller knautschzone? VW-GOLF: Disadvantage in terms of safety to above? ug with four wheel: Subaru Impreza??