I remember a few weeks ago during the summer when Rasmus Højlund joined Manchester United, people were comparing Rasmus Højlund and Erling Haaland because they have the same playing style and Rasmus Højlund could be a good and talented played like Haaland for Manchester United but it seems Manchester United is currently not a good place for young players to use their talents and that's why Rasmus Højlund totally failed so far in Manchester United.
Haland would most likely not perform well if he were to be at Manchester united currently because even in Manchester city where he currently is, a close look at him and you will observe he isn't a play Maker but a goal scorer, he could mostly be used to get goals but he isn't very good with creating chance's and I don't think he has got a good number of assist, so I feel it would have been worse at man u.
He is a good and talented player regardless but Ramus have a better creativity than he probably does, although you can choose not to agree with me but this is my position on how I see them both and considering their current environment where they are currently playing.