Doctrine query using execute

Option 1 and Option 2 seem to give similar results. Is there a particular advantage for using the execute statement rather than the usual getResult() method?

Option 1:

public function getEventsByOrganiser(EventInterface $event, $username)
{
    $qb = $this->repository->createQueryBuilder('e')
        ->select(array('e', 'u'))
        ->leftJoin('e.user', 'u')
        ->andWhere('u.username = :username');

    return $qb->getQuery()->execute(array(
        'username' => $username
    ));
}

Option2:

public function getEventsByOrganiser(EventInterface $event, $username)
{
    $qb = $this->repository->createQueryBuilder('e')
        ->select(array('e', 'u'))
        ->leftJoin('e.user', 'u')
        ->andWhere('u.username = :username')
        ->setParameter('username', $username);

    return $qb->getQuery()->getResult();

}