I don’t think piano will be very useful unless you listen to a lot of piano, and already know some good piano music note for note. And there is plenty a Piano cannot tell you. I think this applies to all instruments/genres - there just isn’t one instrument at the apex (other, perhaps, than the human voice)
If you do listen to a lot of piano, then piano music critical for your auditioning - listen to the music you already know by heart, not someone else’s recommendation
I believe in auditioning with the music we listen to in our lives, and that we know intimately - that’s how we catch differences in reproduction. One captures range, tone, staging, pacing, dynamics, etc., in the track choices for the audition. I think very difficult to audition with unfamiliar music, or music chosen to check some box
I am sure Piano is very difficult to capture. But if I listen to Janos Starker on Cello, “Mining for Gold’ by the Cowboy Junkies, and Song Remains the Same (or Ramble On) by Zep, that covers a lot of ground, as well - and it’s representative of what I listen to (I’ve got a ~15 track standard list, like most folks). I do love all Bach, and so get my piano there (but it’s his cello works on my audition list)