Competition in the Premier League and La Liga is clearly very much different. In the Premier League there are many quality clubs and the atmosphere of competition exceeds that of other leagues and is the world's spotlight football league. Whereas La Liga might only be a few clubs and Barcelona's position would be very easy even though Real Madrid is there.
This is just the absolute different between premier league and other European leagues. In other leagues, youll barely get up to 5 teams that will be consistent to battle for the top for every season. There must always be a team that never fails to make it to top 4 every season. Premier league is not so, even in die minutes, the unexpected usually happens because no team is to be underrated there.
In fact, currently neither Barcelona nor Man United has a specific standard of who will win. Both can play with a draw. Xavi's plus point is the stable balance of players and consistency this season. As for Erik Ten Hag, he still often has problems, such as in the match against Leeds his players were mentally shaken and what worries him the most are the players who are now not in the full main squad.
The fact that theres uncertainty of which team will win the match makes it more interesting and fascinating to anticipate for. Both teams are just good in there own style of play, we shall see who has the bigger guts to take on the challenge and triumph in the end.