What to use: wp_is_post_autosave( $post_id ) or DOING_AUTOSAVE?

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I was doing some action on save_post hook, and noticed that there exists 

wp_is_post_autosave( $post_id )

function.

How does it differ from DOING_AUTOSAVE constant?

If I want my action not to run on autosave should I do both

if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
  return;
}

and

if ( \wp_is_post_autosave( $post_id ) ) {
  return;
}

Or is one enough?

The DOING_AUTOSAVE constant gets defined in wp-admin/includes/post.php, wp-includes/class-wp-customize-manager.php and wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php, whereas wp_is_post_autosave() checks if the post is revision and has autosave in it’s name.

I’m a bit confused what to use, and if it’s good idea to use both.

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