I saw a little bit, basically both were saying that the modern bat, (it was an actual Warner GN Kaboom) was more forgiving if you mis-hit a shot.
They were showing Slater trying to whack the ball as far as he could. One of the measurements was that he hit a ball 65 meters with the traditional bat and 81 meters with the modern bat.
Also they were saying that the middle position was the same, but with the modern bat, the middle position was bigger, something along that lines.
The Warner bat was huge and the jest of what i got was that mis-hits were more forgiving due to the bigger edges.
Another thing that they were surprised at was the weight of the bat, both bats had the same weight which they found quite fascinating.
Personally that might be true, but the willow that Warner had was all taped up, and is basically for performance rather than durability i presume. in the GN video of the Omega range of an interview of Cook, he mentioned that the new bats would break easily )more dried willow, to get bigger size) and that older traditional bats would last more. (they compared both bats in the Video, that i had posted a link leading to the Youtube GN Channell UK).