Mbappe is not a young player anymore. He is quite an experienced player now. And he proved his mettle. He played very well in Ligue 1. Mbappe also performed well in the Champions League. Mbappe has performed very well in the France jersey at the World Cup. Mbappe is a great player. He can be a worthy replacement for Benzema. And Madrid needs a striker who can score a lot of goals. This is why Real Madrid management has been waiting for Mbappe for a long time.
Although Joselu is a talented player, we are not sure if he can play well with Madrid. Joselu's performance at Espanyol was good. From this, it can be assumed that he will play well with Madrid. But there is no way to say for sure.
Even though mbappe is only 24 years old, I believe he still has a lot of playing time ahead of him. The only issue I see with him is that because of his speed, he tends to use more energy than necessary, which lowers performance and is currently affecting Ronaldo. However, mbappe doesn't train in the same way as Ronaldo. Young man has a really strong champions league record, which I believe is one of the reasons he wants to join Real Madrid. I also believe that one of his goals is to help France win the next world cup. Additionally, I don't believe Mbappe will do well in the Benzema position because he is more effective as a winger.