Question on Efficiency of position updates in unity

gistfile1.txt

	// This is the working code.  
	// Aadvantage is simplicity and object is updated on intermediate states.
	// Possible Disadvantage?  I'm issuing updates to the game object transform every frame, 
	// but the only actual update I care about is the last one.
	void Update () {
		MoveShip ();

	}

	void MoveShip() {
		if (Input.GetKey (KeyCode.RightArrow)) {
			transform.position +=  Vector3.right * Time.deltaTime * speed;
		} else if (Input.GetKey (KeyCode.LeftArrow)) {
			transform.position +=  Vector3.left * Time.deltaTime * speed;
		}
		float newX = Mathf.Clamp (transform.position.x, xMin, xMax);
		transform.position = new Vector3(newX, transform.position.y, transform.position.z);
	}

gistfile2.txt

// Alternative to above for question.
// Advantage is I'm not issuing needless updates to the player object.
// Poissible Disadvantage is creating more objects than I need.
	void Update () {
		MoveShip ();
	}

	void MoveShip() {
		Vector3 moveTo = new Vector3 (transform.position.x, transform.position.y, transform.position.z);
		if (Input.GetKey (KeyCode.RightArrow)) {
			moveTo +=  Vector3.right * Time.deltaTime * speed;
		} else if (Input.GetKey (KeyCode.LeftArrow)) {
			moveTo +=  Vector3.left * Time.deltaTime * speed;
		}
		float newX = Mathf.Clamp (moveTo.x, xMin, xMax);
		transform.position = new Vector3(newX, moveTo.y, moveTo.z);
	}