Review Detail of AidenPearce72 in Reincarnated with the author

Both of them are different. Cain's system is a more a naturing type, the type that gives the mc power and boosts permanently every time he achieves quests and milestones. Meanwhile, the primal sin strictly gives a power up temporarily in exchange for sanity. The primal sin is more powerful in a fight but the system is more powerful in gaining power over time.