Saudi Arabia coming for everything? They always picks interests in key European players. Napoli will appreciate the valuable players that have decided to extend their contract with the club despite the hugh bids flowing in for them. Napoli might not be in good shape but they're doing exceptionally brilliant to get back on their heel, Luciano Spalleti leaving the club break them and Walter Mazzarri is doing everything within his reach to stimulates the fire in the club. You mentioned important players, their presence is important for the club progress.
Young players should have decisions like him, because a career in the European league will be better than in the Saudi Arabian league. Indeed, money can provide a better life for him, but how about his career in the future? For a soccer player, the highest peak of his career is not just about money, but his achievement in winning a championship title, or if he cannot get a championship title, he can become a player for the national team. It would be a shame if he chose a career in the Arab League at his young age. IMO
In essence, playing in the big leagues of Europe is the best choice because yes, they will get a lot of great experience in the big leagues of Europe and not just about money. Obviously, it would be best if these young players continue to play in Europe because yes, they will build up experience and mentality which is certainly better in the big leagues of Europe.
Moreover, if they are playing in the Champions League and also in the Europa League and thus, they will have a very good foundation in their football career. Therefore, although playing in the Saudi Pro League can bring in a lot of money, but it would be more appropriate for those who are at retirement age. But yes, for those who are still of productive age, it is clear that young players like them would be better off staying and playing in the big European leagues.