As a listener I tend to like programs with things I know combined with things that are new. I don't mind "war horses" such as the Heroic Polonaise showing up since it's still cool to hear a particular pianist's take on a piece I know well. So maybe 1 war horse, a couple of pieces I know, and a few new/unusual ones would be a good mix for me!
Oooh, I've been recently getting into more classical music lately so my ideal program would be (prob not in this order): 1.Sleeping beauty suite duet (idk what it's called but it's beautiful)2. liebesleid3. Piano Concerto No. 2 in C minor rachmaninoff4. rhapsody on a theme of paginini no 185.chopins ballade no 1 in g minor very your lie in April coded