In the car shot, if you want to do a real fair comparison, then you should shoot identical shots. when he shoots with the H, the H is much closer to the front of the car than the P4 was BEHIND the car. Giving the H much less time to calculate its position to the car and thus making it look like it was unable to stay clear without changing its closeness to the vehicle.
In another comment he said that once you rotate the camera while flying straight, you cannot make the camera go back to its forward posiition. My understanding is there is a switch (top Left 0f controller) that does that for you.
One point he failed to mention though was one that makes the OA win hands down on the H is this...
say i am driving my car down a dusty road and i have the H flying parallel to me so its running along side of me with the camera looking at me. I can turn the H to face forward so that the OA is working where as the P4 would have to have the OA facing me as well. So if a tree or side of a hill was heading in the direction of the H it should stop. The P4 would not know its there.