The match is difficult to predict, because much has already been decided in this clash. Barcelona are favourites, and after the 0:2 home defeat the Gunners have very tiny chances.
But it seems to me that Arsenal will create enough opportunities to score a goal. There is no reason for them to close up. That’s why, I am offering “both teams to score” here. I believe in Arsenal’s goal and don’t doubt that Barca will score too. If you want higher odds, you could pick BTTS and over 2.5 goals. It’s up to you to decide.