I know that Obertan can be useful away on the counter, but this is a game where i can see us have a bit more of the ball compared to our last few games away, so i would much rather see us play Ben Arfa on the right wing as he's got a LOT more quality on the ball and his delivery is twice as good.
Some say he's poor defensively, but imo Obertan isn't much better really, i also think the amount of times Obertan loses the ball or tries to deliver the final ball which ends up being s*** will hurt us more as a team defensively and offensively.
With Ba and Best/Ameobi up front to hold the ball up and a midfield of Jonas, Guthrie, Cabaye and Ben Arfa im quite sure we'll see us have a lot of the ball and spray it around nicely and create quite a few chances as well. Having a go at them (like Manu 1st half/Villa) will make it much easier for our temporary defense. If we sit back even for one half of the game and dont play our game im afraid they will beat us quite easily.