Calculating nav mesh agent turning animations

I have 4 animations, turning left or right 90 degrees and 180 degrees. I have a nav mesh agent and a position in world space I want to set their destination to. How do I calculate which animation to use, according to how much the agent would have to turn to face the target?

 

Code (csharp):

1. Vector3 toTarget = destination - agent.transform.position;
2. toTarget.y = 0;
3.  
4. var angle = Vector3.Angle(agent.transform.forward, toTarget)

 

This works great except I can't distinguish whether or not to the agent is turning right or left

 

There's a Vector3.SignedAngle as well.

 

I used SignedAngle instead of Angle with the agents transform.up as the axis and it viola, it works perfectly now. Thank you!