transform.lookAt speed question

Unity Engine
1

Which is faster?

myTransform.LookAt(target.transform,Vector3.up);

or
Quaternion targetRotation;

targetRotation=Quaternion.LookRotation(target.transform.position-myTransform.position);
myTransform.rotation=Quaternion.Lerp(myTransform.rotation,targetRotation,.3f);

given that one lerps and the other doesn’t which code snip runs fastest?

2

Stop micro-optimising

Also, they don’t serve the same function
One makes the transform look instantly, the other lerps to it over time, so you wouldn’t use them in the same situations.