Performance between Assigned Transform and Transform.Find("Path/Target") using absolute path

Performance between Assigned Transform and Transform.Find(“Path/Target”) using absolute path?
Which one of them is more efficient?

Example code:

public class TestA : MonoBehaviour
{
    //Transform's assigned in Inspector;
    public Transform mTrans;

    private void Awake()
    {
         ***//What does Unity do before function Awake?***
        //Logic code...
    }
}

public class TestB : MonoBehaviour
{
    //Transform's dynamicly found in function Awake
    private Transform mTrans;

    private void Awake()
    {
        mTrans = transform.Find("Root/Target");
        //Logic code...
    }
}

Having a reference defined at design time is always going to be faster than having to look up the reference at runtime. When doing the lookup once in Awake, it’s likely that the time it takes is irrelevant.

And if there is a performance issue use the Profiler to identify what it is. Don’t worry too much about micro-optimizations such as this.