Both won a title in horns. So it can be argued either way, in favor for either.
Calling it recency may be appropriate too. Or maybe it's just a term you're using to dismiss an opinion you disagree with.
Kurt, after all, was not Kurt as we know him in the playoffs outside of games like vs the Vikes where he ate their asses. There were quite a few games where he struggled.
Stafford's strengths being different make him more potent in those close games.
For myself I will say that Stafford is better. And my reasoning is because what he did over that 4 game playoff run was of the highest rarity in quality. He never had weapons like Kurt had. Not even in horns.