Which of the following piano pieces is harder to pull off successfully

[bach-busoni chaconne]

Which of the following piano pieces is harder to pull off successfully (considering musical and technical aspects) in a concert?

[liszt-and-the-galops]

Not too familiar with the Schumann, but IMO among the others:

Easiest (but still extremely difficult)
Chopin 10/1 + 10/2
[gap]
Hammerklavier
Liszt 139/4 + 139/5
Gaspard de la Nuit
Petrushka
Hardest

[rachmaninoff_forever]

Completely impossible to answer.  It’s entirely dependent on what your strengths are and who you’re playing for

[lelle]

I don't think Kreisleriana belongs on this list. It's not easy but no where near the technical difficulty of the other works.

Given that a number of pianists who play many of these works in concert do not perform Chopin Op. 10 no 1. + 2. I cast my vote for those.

[roboute guilliman cfa]

No mere two etudes, even the most outrageous Godowsky or Liszt s140 or Mereaux etudes, can be  comparable to these longer form pieces in difficulty. Maybe 4 or 5 etudes' worth.

I think the nuance of Chopin op 10 no. 1 and no. 2 is how much specialized, niche preparation they take. Similar to a piece like the Schumann Toccata where the level of nicheness (in the 'overkill'-esque level of focus on the technique in question) is so high it's a drag on the rest of a concert pianist's time. No other piece requires this level of wrist rotation or lower fingers crossing over higher fingers chromatically, or this level of double notes.

And the payoff of pulling them off is kind of limited for the average audience vs. a full on showpiece like say Liszt hungarian rhapsody no 6.

So I think the low incidence of programming is due to lack of incentive and skewed effort-reward ratio. Lots of amateurs, even young kids, who don't go on to major in piano or to conservatory will have played these pieces or are currently playing these pieces. For a professional it's purely a matter of overall load management. They usually maintain a few hours worth of repertoire, they only have a certain amount of time you can allot to your very technical pieces' portion of repertoire, which they'd probably use for a more bombastic or longer piece.