Don't know who their best player is, but one thing was clear yesterday, when Messi came in, the other players found their football again, up until that moment, Barca was weak, after Messi came in, they seemed to found some believe again, and a few minutes later, they scored.
But I would have preferred PSG, just looking at for example Alba's reaction when he fell down just makes me sick.
Or Fabregas's reaction after he fell over his own feet, bah.