In the Europa League they won't necessarily get a trophy, because even here the competition will be very tight, moreover they have to get rid of Manchester United first to move on to the next round. This is a very difficult thing to do.
well, manchester united is a very inconsistent team that is going through bad times, in a short time they had many coaches, they also had problems with cristiano ronaldo and in terms of team performance it is not a good performance when they play against big teams , they are not competing to become premier league champions, in fact they don't have any chance of becoming premier league champions, so when you look at that scenario you realize that manchester united is not a great opponent in which the barcelona need to struggle to win
on the other side we have barcelona who also recently changed coaches, dismissed several good players and this made the team completely unbalanced and lost the good form they had to play, however the club management managed to hire xavi who is restructuring the team and you can't expect great results right away, this is a long process, but in terms of quality barcelona is far superior to manchester united, so i believe barcelona will win this game against manchester united