Barcelona and Xavi are aiming to win the La Liga title and the Europa League title. On the other hand, Ten Hag and Manchester United's main goals are to qualify for the Champions League and the Europa League title. Arsenal will also continue to fight for the Europa League title. It is difficult to predict which team will win the title. But every team has a good instinct to win the title. United and Barcelona's performances have been somewhat unstable, but both have strong squads. But both the teams have enough time to organize themselves and strengthen the team.
In fact, it is very difficult to say now what priorities Arsenal, Manchester United and Barcelona will have in the EL. It is possible that Arsenal and Barcelona will have to focus on their championships and since I think that they have already secured a place in the Champions League for next season, the EL may not be their main priority tournament, and they may sacrifice it if the situation requires it.
Even right now, predictions are not easy for the few events but still things looking interesting because Arsenal is already having good season with they are leading in Premier League and have fair chance in UEFA Europa Cup and same happening in case of Barcelona which is leading La Liga and can go through for this cup as well.
But, we are really surprised with Manchester United now they are having spot into EFL Cup with fourth spot in Premier League and their hopes are also alive for the FA Cup and UEFA Europa Cup mean they are strong in these all four events and surely wants minimum two in their dream season because this will be amazing after many years they are in this position and have strong case for the win even still sometime needs to have better view but still they are at their best with current squad and coach Ten hag.