Scuffet's got over-hyped as the next Buffon IMO and his development has really stalled this season with Orestis Karnezis' return from Granada (0 league starts for Scuffet). He's talented but is a bit error prone and his mentality has been questioned at times this season, which is very important for the position.
Perrin was in the World Cup squad and for his club - he already plays like a veteran in terms of confidence and consistency, very rarely makes any errors, turns up vs Juventus, Napoli, Fiorentina, Roma; and has had a massive part in leading Genoa to 5th in the league this season after also keeping 11 clean sheets last season. Definitely the best young keeper in Seria A as of right now - ahead of Romero and Handanovic.
Their developmental rift is too huge right now considering the age difference between them - only 3 years. That said Scuffet is certainly capable of being a special goalkeeper, as are Leali and Bardi. Funny how Italy always manage to produce great goalkeepers - Zoff, Zenga, Pagliuca, Buffon, Peruzzi, De Sanctis, Combi, Toldo, Galli while others struggle to find even one of equivalent quality.