Yes, if we look at the head-to-head history between Barcelona and Man United, indeed Barcelona has a superior history with 5x: 1x wins. This might provide more enthusiasm for the Barcelona players.
Barcelona have better head-to-head record against Manchester United and it is one of their advantage with history voice and mentally support for their players. However, they are actually stronger if we count their performance in La Liga, their ranking there with what Manchester United have in Premier League.
And I'm sure Xavi will not underestimate Man United because he was also a player, and he has to ensure that to the players in his squad.
Xavi is a young coach but he has a long and successful player career with that he has a lot of experience with tough matches. He surely knows how matches can turn around so quickly and in big matches, there is no place for carelessness and subjective contempt.
What's more, Man United is currently also very on fire after being able to rank in the top 3 in the EPL. But on the other hand, Barcelona is also in very good condition this season, they certainly also have the same hopes to hold this European League trophy. So, it will be a very interesting match compared to matches from other clubs.
With latest performances of Manchester United after World Cup 2022, Ten Hag and his players are bringing more challenge to Barcelona. Their matches will be so exciting between two teams which have very excellent forms recently.