One script per object, or multiple objects accessing one script?

Hi folks,

I’m curious as to what would be more costly performance wise, and additionally, what would be a better method of implementation (if either): Passing a GameObject to one master “move” class that all objects can access – OR – Attaching a move script to every object that can move, passing no GameObject, and simply using attached gameObject.

An example of what I mean.

public class MoveThings : MonoBehaviour {

/*this script, attached to one "move manager" GameObject that all movable objects access*/

  void DoMove(GameObject thingToMove)
    if (thingToMove.tag == "Player")
       thingToMove.transform.position = Lerp... //Player specific movement variables
    if (thingToMove.tag == "Enemy")
       thingToMove.transform.position = Lerp... //Enemy specific movement variables

//OR this script, attached to ALL things that can move.

class MoveThings: MonoBehaviour {

  void DoMove()
    if (gameObject.tag == "Player")
       DoPlayerMove... //Using attached gameObject
    if (gameObject.tag == "Enemy")
       DoEnemyMove...  //Using attached gameObject
    if (gameObject.tag == "specialEnemy")
       DoSpecialEnemyMove...  //Using attached gameObject


Thanks! Apologies if this has been asked before. I tried searching a few things, but I wasn’t certain what I should even search.

Edit: I just realized I didn’t update my title appropriately. Changed it to fit my actual question better.

Consider using a different script (or at least, a script with different classes) on each object that moves. Then you eliminate the 'if’s. If much of the functionality is the same between such classes, have a ‘base’ class which does the common stuff, and sub-classes which handle the particulars (for player, enemy, etc.)