How can I play different animations depending on the direction my character is moving?

I currently have a Walking animation, 2 strafing animations, and the walk animation in reverse, but I am unsure how to make the game notice what direction I'm moving so that it can play the correct animation...

Walking = forward relative to the character Strafe Left = when I move to the left ETC.

I thought about just doing something like If(Input.GetButtonDown("w")) { animation.CrossFade"Default Walk" }

 If(Input.GetButtonDown("a"))
 {
      animation.CrossFade"Left Strafe"
 }
 
 If(Input.GetButtonDown("d"))
 {
      animation.CrossFade"Right Strafe"
 }
 
 If(Input.GetButtonDown("s"))
 {
      animation["Default Walk"].speed = -1;
      animation["walk"].time = animation["walk"].length;
      animation.CrossFade("Default Walk",0.2);
 }
 
 But I was wondering is there a way to do something similar using the

 If(Input.GetAxis("Horizontal")
 {
     Controller.Move((horizontal * (walkSpeed * Input.GetAxis("Horizontal"))) * Time.deltaTime);
 }
 
 If(Input.GetAxis("Vertical")
 {
     Controller.Move((vertical * (walkSpeed * Input.GetAxis("Vertical"))) * Time.deltaTime);
 }