Jaka jest różnica pomiędzy:

    //Some code, takes a bit of time to process
    (new SomeJFrame()).setVisible(true);

    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            (new SomeJWindow()).start();//Start a new thread
        }
    });

I:

    class doGraphics extends SwingWorker<Void, Object> {

        @Override
        public Void doInBackground() {

           //Some code, takes a bit of time to process
            (new SomeJFrame()).setVisible(true);

            return null;
        }

        @Override
        protected void done() {

            (new SomeJWindow()).start();//Start a new thread

        }
    }
    (new doGraphics()).execute();

Którą metodę lepiej użyć?