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However, what makes Man United superior is their mental condition because they don't have a bigger burden than Everton. Everton's demands are currently out of the relegation zone so at least that will affect concentration on the pitch.
I can agree that MU players are better equipped mentally but not because of your reasoning that they have less burden to carry. Do not forget that they are one of the biggest club in the world and majority of their huge fan base probably expect them to finish in the top 4 at least. That alone is a bigger pressure to win most games specially against smaller clubs like Everton.
Renowned Premier League team Manchester United and this team has a huge fan base all over the world. And fans want to see the team in the top four of the table. But Manchester United's performance is still very unstable. Maybe the team has won in the last three matches, even then the performance of this team cannot be said to be good. They don't play well against big teams.
United's performance against Everton was mixed. Although they attacked less, each of their attacks was very organized. However, the team still needs improvement. Despite having a lot of talented players in the squad, Ten hag is unable to bring consistency in performance.