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Actually there is no guarantee either but seeing from the tension of the game in Ligue 1 and Serie A which is not too different, it is possible for Osimhen to develop better in Ligue 1 with more complete resources. At least if he moves to PSG there will be several trophies that he managed to bring as his achievements because until now there is not even one that can be considered a rival for PSG when talking about domestic competitions.
His ease will be more pronounced at PSG than if he goes to the EPL considering Chelsea also wants him because his future is more uncertain in the EPL than Ligue 1.
At the moment Osimhen is still very able to improve his performance especially he is still very young so I think the chance to develop in Ligue 1 (PSG) is still very possible for his individual achievements rather than him going to Chelsea.
Osimhen has the opportunity to win a trophy every season if he joins PSG and plays in Ligue 1, apart from that, Osimhen also has the opportunity to play in the Champions League every season. Osimhen deserves to consider these two factors. If he leaves Napoli, moving to Chelsea is not a wise decision for a bright future. For now and next season, Chelsea seems to have difficulty competing with other top teams in the Premier League, and it is certain that next season Pochettino squad will again miss appearing in the Champions League.
So it stands to reason that Osimhen would be better off going to PSG if the other offer that comes in is Chelsea. Apart from that, Osimhen performance this season is not optimal, it is very much lower than last season, especially since he suffered an injury while defending his country competing in the AFCON Cup. Whoever is interested in recruiting Osimhen, the eccentric President of Napoli will not let his best players leave for a cheap price. PSG and Chelsea don't seem to be having problems regarding money, but the final decision is up to Osimhen.