I feel that Venustatus is the most important of the Vitruvian Triad. Then I believe that it would be Firmitatis and then Utilitatis. This is because beauty is the biggest divider between building and architecture. I also think that beauty is one of the most powerful things in the world because it can trigger so many emotions. Firmatatis would come next because it is more important for a building to be able to stand then be usable.