On the other hand, with computer aided driving or simply better drivers, the lighter one will be much more maneuverable and it will avoid collisions much better

On the other hand, with computer aided driving or simply better drivers, the lighter one will be much more maneuverable and it will avoid collisions much better, while also having more mileage. In particular, if the car is FWD, you will understeer and lose control of the car by heavy braking much easier in a heavier car. A lighter one would simply steer away from the wall or the other car. I know that I prefer the lighter one if the power and torque are the same.