Trust me, you don't need to listen to the intro. Controller is no better than keyboard, other than to those who prefer using a controller over a keyboard.
You could even argue that keyboard is better as you can switch from moving left to right and vica versa farster with a keboard.
Yeah, there are a lot of small differences between the two that do make them everso slightly better. And frankly, that's the only one I can think of.
I can think of a couple in favour of the controller:
-has convenient buttons to hold down aka run buttons (shoulder buttons usually)
-key presses usually feel less loose than on a keyboard
-feels more natural to hold for extended periods of time (this depends on your preference and your controller obviously)