Abhik on "Best Practice for Conditions"

What is the best practice to implement conditions? Within callback or wrapping the hook?

Like,

function myfunction() {
	if ( get_option() ) {
		// Do Something
	}
}
add_action( 'hook', 'myfunction' );

Or,

function myfunction() {
	// Do Something
}
if ( get_option() ) {
	add_action( 'hook', 'myfunction' );
}