Is this a matter of labeling? I know that there would be no such thing as a priority ranking per se, I ask this only expecting something as concrete a comparison as, say, the tier list (meant as being equally situational). If people can come up with a ranking system for air-ground and ground-air like stated in the official tier thread, can't couldn't there also be something similar for whatever moves are considered high-priority? For instance, there's been some discussion over which 6Ps are 'good' for antiair (more or less a priority issue), and then there's the air moves that people would say always win (Jam aS?). So... what happens when you pit them up against each other?
From what little I have seen, I would be saying something like: Slayer aHS hitbox seems to extend long enough to beat many 6Ps even despite their upper invincibility, and almost regardless of character. I know it isn't true all the time, I've also seen it lose out when thrown from too high up, too far out, or too late - but I would consider these abnormal circumstances. As a jump-in, it typically wins.