Which syntax is more better to use?

syntax-type-1.jsx

class MoviesApp extends Component {
  render() {
    var initialRoute = {name: 'search'};
    return (
      <Navigator
        style={styles.container}
        initialRoute={initialRoute}
        configureScene={() => Navigator.SceneConfigs.FadeAndroid}
        renderScene={RouteMapper}
      />
    );
  }
}

syntax-type-2.jsx

var MoviesApp = React.createClass({
  render: function() {
    var initialRoute = {name: 'search'};
    return (
      <Navigator
        style={styles.container}
        initialRoute={initialRoute}
        configureScene={() => Navigator.SceneConfigs.FadeAndroid}
        renderScene={RouteMapper}
      />
    );
  }
});

I found more examples whitten in syntax-type-2.jsx but i like more syntax-type-1.jsx.

Which syntax is more better to use?