Oh my goodness, the PMD storylines make me cry HARD. They're so well put together and the character development and attachments are amazing. I can't decide which one got to me more though. xD They're very similar, but also very different.
And I think if they made a PMD for the 3DS they'd make it in the style that they did for the Wii version that never left Japan, where it's all in 3D. :3