Very good video.
Apparently some streamer said the vertical grip was best. Probably due to ADS however angled all the way from now on.
Angled grip is way better. Assuming most of us can drag down to compensate for vertical recoil. Angled grip minimises the complete randomness of horizontal re-coil which is way harder to control/predict.
Although saying that, if all you do is tap aim. Then that 10% faster ADS would be better.