On Collision know which collider induced it

Got 2 boxes. One of them crashes against the other. Having the Collision, how do i know which one was?

The following should do the trick:

void OnCollisionEnter(Collision collision)
{
        //collision.gameObject

        //Edit:
        //Compare velocities to figure out which one has the higher one and therefore “initiated” the collision
}

There is also a 2D version if that’s what you need but otherwise, with the function above collision.gameObject should be what you need! Hope this works and good luck!