Anything seems possible, both teams are currently in good form holding the top position on respective leagues. A draw is likely but if we are to give the lead, I think any of the both teams can fortunately take the winner, either Bayern or Barcelona but definitely we must see a good fight there. If not a draw at the end we might see a one goal lead from any of the team.
Let the best and Probably lucky win in this game, like you have said and its been what we have seen recently, both teams are in a good shape currently and so its more difficult to predict who is going to win and for games like this just to be on the safe side, maybe you could wait till kick off and probably paly on live game, that will give you a better insight into who has got a better chance of winning or better still you could make a pick on other things other than winning this game.