Eternal Punishment is the hardest? Well, guess they didn't chose that name without a reason.
I already thought P1 to be a little too punishing, especially with status effects.
On the other hand the re-release of Innocent Sin is so easy, at least on easy, I don't even have to worry. Considering I'm on Jetto's side considering the dungeon design, I'm glad the game is on the easy side, so I at least can focus on the story without wasting god knows how much time in dungeons.
I'm about half-way through IS and even though I have mixed feeling, I'm still having fun I'll pick up EP. I just hope Atlus adds that sweet easy mode IS has.