What is Difference Between Policy Authorize vs Can Function In Laravel?

I'm using laravel basic policy system to protect unauthorized user from update post. For Example User have Id 1 and In posts Table User_id is also 1.

Now in $this->authorize('update',$post); way i can pass only one variable $post to authenticate .while in can method i can also use $user variable $user->can('update',$post) for authorize. Here is code

In PostPolicy.php

public function update(User $user, Post $post)
{
   return $user->id === $post->user_id;

}

In AuthServiceProvider.php

    protected $policies = [

     Post::class => PostPolicy::class
                           ]

In Controller Authorize way

public function update(Request $request, $id)
{
$post=Post::find(1);
$user=User::find(1); 
$this->authorize('update',$post);
return 'Hello Everything Access For You ';
}

Using Can method in Controller

public function update(Request $request, $id)
{
$post=Post::find(1);
$user=User::find(1); 
if($user->can('update',$post)){
return 'Your are allowed';
}
else
 {
 return 'Your are Not allowed'; 
 }
 }

is i'm right for these two functions. Is there any Difference. Which method i have to use. Thanks in Advance

via Chebli Mohamed