Hook/Filter arg best practice

gistfile1.php

<?php

// Consider the following hook
do_action( 'my_swanky_hook', $a, $b, $c );


/*
 * I would traditionally attach as follows:
 */
function my_swanky_hook_handler( $a, $b, $c ) {
  // Code here, that only actually uses $a
}
add_action( 'my_swanky_hook', 'my_swanky_hook_handler', 10, 3 );




/*
 * However, given that $b and $c aren't used, is the following preferred:
 */
function my_swanky_hook_handler( $a ) {
  // Code here, that only actually uses $a
}
add_action( 'my_swanky_hook', 'my_swanky_hook_handler', 10, 1 );