PoDD lunatic, definitely. I remember when I first did it, there were people who thought it was literally impossible. :derp: It's the only lunatic 1cc I've never replicated, because god damn Chiyuri whyyyyy.
Also, while I know this will sound snobbish, the vast majority of people who say HRtP is the hardest don't know the correct way to play it. That said, not many people know how to play it. :v It's not that tough if you know the secret to clearing bosses quickly.