I like the "S" type bubbler air lock for the reason of being able to clearly see activity better, as even with a slow ferment, you can still see the water level moving better than waiting for the 3 piece to rise and release a bubble. And they arent that hard to clean. Just soak em a bit and rinse them by holding them upside down when you run the hot water through them. They flow like crazy when they are inverted.
Of course the 3 piece cannibalized makes a great blow off tube.