This match is equally important for Barcelona and Girona. But I think it could be a draw. Both teams have lost once each this season. It's hard to say who will win, but it will be a very interesting match. Girona should not be underestimated.
This match will be a test about the readiness of Girona to grab the title this season. Girona will have hard time trying to defeat Barcelona in their home. Bookies are backing up Barcelona much to win that game. The comparison between the names and skills of players are way in favour of Barcelona side. Girona's players have to prove themselves in this match and make everyone respect them for what they did so far 
Although Girona is in second place and Barcelona is in third place at this moment in the La Liga standings but still, Barcelona is still the favorite team to win in this match. Because ya, after all, so far the fact is that Girona has also experienced defeat, and the defeat experienced by Girona occurred when Girona played against Real Madrid. With results like that, then yes, at least it is still quite possible for Barcelona to give Girona a second defeat this season. But yes, at least if Girona manages to make a miracle then maybe, Girona will also still get points because it looks like Barcelona does not have a stable performance at this moment.