Multiple Colliders, Single Object

Hey all,

I have an object that has a sphere collider and a capsule collider on it. I am using the capsule collider to simply detect when the player is selecting the object and do some movement code, while I want the sphere collider to handle some interactions with other things it encounters as the object moves throughout the gamespace (read the sphere represents a grav field outside my ship that picks stuff up as it travels).

some code:

void OnCollisionEnter(Collision other) {

  if(other.collider.Equals(SphereCollider) && other.gameObject.CompareTag("FloatingStuff")){
     Debug.Log("stuff grabbable");

 }

}

So simply put how do I tell that my collision is by my sphere collider rather than the capsule one?