Finished DDS2's storyline on Hard. I'm not sure which of the 2 DDS games was easier. They do both have their difficult moments though. Probably the easiest SMT final boss from the ones I've played. I do know the first SMT has easier ones(since you can Zio stunlock almost everything), but I never played that one. I did lose to the final boss once on this game(I didn't in the first one), but there's not much you can do when he uses a move that full buffs him and full debuffs you with 1 turn, crits you several times, then follows with a mind charged spell.
Anyway, I beat Vishnu before beating the game, so that leaves only Shiva, Seth, and Satan left. I need to beat Shiva to get to Seth and need to beat Seth in order to get to Satan. I know there will be a lot of grinding though. I've tried Shiva a few times, but I can't help to think this is a completely stupid boss fight. It repels(loss of all your remaining press turns) different elements on each turn, and the game doesn't even do anything to hint at which elements can hurt him.