You forgot to mention that Manchester United is also ready to compete with PSG to sign osimhen from Napoli. Several clubs are monitoring his performance in Napoli, but it will not be difficult for an EPL club to grab his release clause. Osimhen was a potential striker, but he was playing the wrong club. Napoli was not able utilizing his true potential. That's the main reason osimhen must leave from there.
Osimhen looks like he will be a target for many clubs in the upcoming transfer market because of his outstanding performance with Napoli at the moment, many teams such as PSG, Arsenal and Manchester United are interested in signing him but indeed all decisions at the moment are absolutely in the hands of Napoli, I don't think when Osimhen stays at Napoli will make his career better in the future and the only solution for players who want to continue to develop of course Move to another better club.
There are several clubs actually that could be an option for him, Psg of course have all the needs that Osimhen might need as a professional player, a big salary, a main striker, playing in the Champions League and winning the Ligue is certain they can give all that to Osimhen, whereas if he joins Arsenal, of course the salary may be lower, Playing in a competitive league and also the main striker will probably belong to Osimhen because indeed Arsenal currently do not have a good striker after Van Persie departure, if he playing at Manchester United, he have to compete with some good strikers at the moment and certainly to play in the Champions League obviously Osimhen will have to wait a few more seasons because even this season Manchester United is still ranked 6th in the Premier League standings.