Screen Boundary Solutions

Hello,

I found two piece of code in unity answers to set the screen boundaries. I want to know if there is any advantage using one over than the other.

 maxlimit = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width,Screen.height,0f));
 minlimit = Camera.main.ScreenToWorldPoint(new Vector3(0, 0, 0f));

Second one:

 float camDistance = Vector3.Distance(transform.position, Camera.main.transform.position);
         Vector2 bottomCorner = Camera.main.ViewportToWorldPoint(new Vector3(0,0, camDistance));
         Vector2 topCorner = Camera.main.ViewportToWorldPoint(new Vector3(1,1, camDistance));
         
         
         minX = bottomCorner.x;
         maxX = topCorner.x;
         
         maxY = topCorner.y;
         minY = bottomCorner.y;