Which is best for AI hitting player?

Which is the best way of doing this I want to go with what I know

1) make it so that once an enemy is a sphere collider i make a boolean tick attack and the AI animates and attacks

2) use a raycast to see distance and then attack with animator>boolean

when AI hits will it be my mesh collider I use to take the attack or would I make sphere colliders on objects on certain points of my player so say head, arm, leg have sphere colliders?

 

I'm mostly clueless on scripting ,so far, but most efficient way should be 2 put 2 colliders on mobs one for collision detection( () ) and the other as a istrigger(box circle etc) with a larger radius to represent the distance at which the mob will activate(triggered action).with rays it has to be always checking and in multiple directions a istrigger does not.

As for diff body parts guess if u want to take damage to various parts instead of a whole then maybe but else a single collider is prolly better.

 

Cheers man this was for a real time battle system but decided to a do a turn base battle system so all is good