color me confused, but at this level of rep. you are picking pieces to study based on diffuculty or demand? why not look at which you like more, which speaks to you more significantly, which do you connect with emotionally in a way that you can 'say something personal' in your performance of it, or which exposes short comings in your technique apparatus or musical sentiment and thus wrestling w/ it could improve those things so you finish it out better than when you started?
-i am sure this has not been done before
That would mean treating piano as an art, not a sport. Where would that end?
Not this week, anyway.