I think there can be a really good debate about which player is actually better, Mbappé or Haaland. Based on what we have seen, so far, I think we can easily say that Erling Haaland can definitely be described as a better player compared to Mbappé. And let's not forget that English Premier League is definitely a lot harder compared to Ligue 1. And that is a big reason why I think the current performance of Haaland is better compared to Mbappé. But both are definitely up there as the two most important and probably best young players right now. It won't be very wrong to expect them to be the replacement for Lionel Messi and Cristiano Ronaldo.
Another thing is, I don't think personal performance actually means anything if the team is not winning. Haaland with Manchester City has been able to win a lot of things so far. The same cannot be said with Mbappé with PSG.
Haaland is a good striker, but you can't compare him to mbappe. In my opinion mbappe is more talented than Haaland because Haaland is just a finisher who can't work with the ball and can't great a chance for himself, whereas mbappe is a hard player who works with the ball and has a great chance to score PSG did not go fa in the champions league last season, finishing in the top 16 in the competition, without comparisons they performed very poorly last season in the champions league, I don't know when PSG can win the champions league, if mbappe leaves psg now and goes to another club like Real Madrid or another club you will win the champions league.and you will know who is a great player Haaland or mbappe.