[Python] Conflicting tutorials: Should new development use GtkWindow or GtkApplication in...

I have just started learning about creating GUI apps in Python. I decided to use Gtk version 3. According to the (official?) tutorial on The Python GTK+ 3 Tutorial the proper way of building a hello world application is:

from gi.repository import Gtk

class MyWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self)
self.set_default_size(200, 100)
self.connect('destroy', Gtk.main_quit)
self.show_all()

MyWindow()
Gtk.main()


In other tutorial ("Hello World" in Python with GTK+ 3) I found completly different aproach which is:

from gi.repository import Gtk, Gio

class HelloWorldApp(Gtk.Application):
def __init__(self):
Gtk.Application.__init__(self, application_id="apps.test.helloworld",
flags=Gio.ApplicationFlags.FLAGS_NONE)
self.connect("activate", self.on_activate)

def on_activate(self, data=None):
window = Gtk.Window(type=Gtk.WindowType.TOPLEVEL)
window.set_title("Gtk3 Python Example")
window.set_border_width(24)
label = Gtk.Label("Hello World!")
window.add(label)
window.show_all()
self.add_window(window)

if __name__ == "__main__":
app = HelloWorldApp()
app.run(None)


Could someone experienced in this category tell me in what way should I write Gtk 3 apps in python these days? I'm already familiar with writing GUIs (spent few months in Java's Swing) so you can go on with terms like events, callbacks and so on..

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