The first video shows how to program where the result is one motor goes on or the other. So the net result is there is a jerking action on one side or the other.
The second video is totally different so when rudder is applied, one motor increases say 100rpm's and the other side decreases 100 rpms. That way, the action of equal forces on each side (fore and aft) gives a smoother turn.
The second reason it's better is there is no programming to do. All you do is plug the elevator into throttle(like both side of a plane, they go equally up or down, so both throttle go up or down. The aileron is plugged into rudder(just like a plane, one side goes up (add's rpm to that motor) and the other aileron goes down(so that motor decreases the same as the other side increases) and produces an even force around the CG, so it doesn't jerk.
So for about 12-$15 dollars, just plug it in and your set to go.
Works real good with EDF's, where if you do the first of only 1 motor adding or subtracting, it makes terrible turns with rudder.
I like to design and fly unique planes.