Now Osimhen obviously needs to leave, but PSG is not the best choice.
To me, PSG is not a bad destination for Osimhen. Mbappe will most likely leave at the end of the season and that would make Osimhen the point man for PSG. He will score a lot of goals and win trophies thereby increasing his market value and cementing his name as a top striker in Europe.
Chelsea is another club that has shown interest in Osimhen. Going to Chelsea will be a bad decision. Chelsea are currently struggling and they don't have the players to feed Osimhen properly.
Aside from PSG, another club I think would be good for Osimhen is Arsenal. The kind of football Arsenal plays will favor Osimhen.
Arsenal play from both flanks and also from the middle. One thing strikers love is getting so much support from the flanks and the midfield. That means he's covered. All he needs to do is position properly and be able to build up play with the midfielders and wingers.
Mbapee will definitely leave, but why do you think that Osimhen will be the first violin in PSG’s attack? There are Ramush and Kolo Muani, perhaps they will “accelerate” against the backdrop of Mbappe’s departure and Osimhen will still have to try to win the competition against them.
As for the fact that achievements in League 1 will help Osimhen, I seriously doubt it. Do you remember who was the top scorer after Mbappe in recent years? At least one player?
Mbappe is known for his achievements for the French national team and for the fact that he is truly phenomenal. Achievements in League 1 are a fiction of no interest to anyone, because even if someone scores 50 or 100 goals there in a season, everyone will discuss not this achievement, but “how much he can score in a normal league.”