As things stand right now, without further skill advancement Temari would win easily. Hinata's very underachieiving right now.
If you are talking about future, thats an entirely different question. Yes we know some of Hinata's possible Hyuga abilities, but we don't know anything about what Temari could learn, so its sorta hard to assume on what would happen in the future. And I think Temari is a strategist, not on the same level as Shikamaru but is still good. She does some stuff in all of her fights indicating that she is planning ahead, realizing what she has to do etc. Getting outsmarted by Sasuke (in their fight) isn't anything to be ashamed of he is an Uchiha after all.