Difficulty is subjective. Chopin Nocturnes could be as hard as Xenakis for some people. Just look at the music, or listen to it, because I'm sure you haven't done that already. Mozart is the hardest composer, because there are so few notes in it, especially for pianists who think Feux Follets is easy (excuse me: "very easy").
Hope that answered your question.
Just kidding. Aren't these guys really helpful? Petrouchka is notably more difficult than the Rach Op. 16. Lots of tremelos in the fingers, locked wrists, massive leaps, awkward 9th chord progressions played fast and parallel, extremely fast arpeggios across several registers, extended trills/scales in thirds. It's on Hamelin's shortlist of pieces that he says he'll never play because it's so unpianistic; whose opinion do you want? Guys posting above me, or Hamelin's? Rubinstein commissioned it, then refused to play it because it was too hard; required an easier version to be made up. It's top 10 hardest, as far as standard solo repertoire goes.
Although honestly, it's kind of obvious which one is more difficult. Not sure why you didn't just sit down at the piano and try it out; wouldn't take long.
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