Well, in terms of super dickery, Stark loses. 😄
Even if it's Civil War Stark, because he believed he was doing the right thing. Dox, he just doesn't care.. For him, screwing over his friends and comrades isn't a special event, it's a Tuesday.
That said, I'm going with Stark. Dox needs a psychological edge to win, or people to manipulate towards his own ends, and in an arena fight he'll have neither..