Voted Zoro, Law isn't a strawhat. Could see a case for Sanji too, since the crew would be absolutely screwed without him, but Zoro's moment was too impactful.
But man PH Law was built different, really the single time a non Luffy character took hold of an entire arc start to finish. And he singlehandedly kickstarted everything that takes place post timeskip. Rare moment from Oda, first and last time we'll ever see something like that. We took it for granted when it was happening.