@Transactional jakie podejście jest lepsze i dlaczego?

public interface Service {

  void forcedTransactionalMethod();

  @Transactional
  void questionableTransactionalMethod();
}

 public class ImplementedService implements Service {

  private DummyDao dao;

  public void setDao(DummyDao dao) {
    this.dao = dao;
  }

  @Transactional
  public void forcedTransactionalMethod() {
    dao.getJdbcTemplate().update("INSERT INTO PERSON (NAME) VALUES ('ME')");
  }

  public void questionableTransactionalMethod() {
    dao.getJdbcTemplate().update("INSERT INTO PERSON (NAME) VALUES ('YOU')");
  }
}