I really like epicaricacy because there really are no others of it's kind. Schadenfreude perhaps is similar, but It's a german word. However, it is fun to say. I'm not too fond of Sadism, considering it applies to torture and sexual mutilation most often, while epicaricacy and schadenfreude apply to enjoyment of other's pain. The difference is that sadism is where you inflict the pain, whilst epicaricacy is where you enjoy their misfortune no matter what.