The opportunity for Mbappe to win an individual title with Real Madrid is greater than if he stayed with PSG, has large possibility for winning UEFA Champion League trophy with Real Madrid than PSG and he will get more support to be the best players when joining with Real Madrid. But Mbappe have ready with consequence about his payment salary, actually Madrid will reduce the payment salary received by Mbappe with PSG and he will get cut off few percent of his higher salary before.
Depend with Mbappe if want to win more trophies and get chance for winning individual achieving Madrid is the best club for him but he wants priority with higher payment salary he can extends contract with PSG for long term duration.
That's why I said that the opportunity to play at Real Madrid would bring him to the next stage of his individual career. Because this club has a long history and has always been the favorite team in the Champions League, the opportunity for Mbappe to achieve career heights is quite wide open. The decision to cut his salary by a few percent is not a big problem because he can still earn a more decent income by attracting certain sponsors because when he reaches the peak of his career there will be many sponsors who will want to work with him.
We are not saying that PSG is not a great club, but if you look at the current conditions, there is no chance for Mbappe to achieve an individual career or bring the Champions League title to the club. Because there are a lot of preparations that need to be made by the coach and it may take several seasons for PSG to establish itself as one of the teams to be taken into account.