i think that Matthias won over Dominik because of the 'variety of tricks' factor. Even though Domink has a lot of incredible variations, and many switches going on all the time, they still all fall into the same family of tricks with the steamroller beeing the pivot between almost every trick. I havent thought this over very much, its a first impression...
Don't get me wrong im a big fan of Dominiks riding, and he kills it from beggining til the end. I'm just thinking out loud why he did not get the win. And i would say its because Matthias runs is filled with links that have more diversity. thats all.