I'd vote for Josh but I'm biased.
Mahomes has the best stats and most TDs, but Allen is close AND Allen beat Mahomes and the Chiefs.
Hurts is having a great season BUT he isn't on Allen or Mahomes level.
Who I root for will have nothing to do with the outcome of the game.
The only thing I can root for when brady plays is for him to throw multiple interceptions and for him to get hit in the face repeatedly.