Mahomes.
One can make arguments for Jackson, Allen and Stroud considering the condition of the Texans.
To be mindful this is not just about stats...here is my subjective point. I recall watching QB's Marino, Elway, Mahomes and when they stepped on the field with 2mins left, you knew the opposing team was screwed.
We don't look for Tua either, we look for Hill (and the opposing team fears Hill) in those 2 mins....that is the difference. We shouldn't pay 50M for viable, we made the mistake @#5 for just viable in my opinion.