One difference that I know between these two methods is that in Manager screen method one screen remains open at any given moment (i.e. the Manager screen) but in Tribblehunter’s method no screen remain open as you always close the active/current screen before going to another screen.
The difference is that on slower phones one method is fast and the other is slow.
Closing the main window and re-opening it may take up to 10 seconds on slower devices.
The second difference is that if you do not close the main window, then the “Notifier” component will not work properly.