I remember the sales guys in the shops being proud of certain speakers capable of reproducing piano exceptionally well. It's not an attribute one would have to discover on their own. So I think a well informed individual would by necessity choose piano firstly.
What Instrument would you listen to?
Ok, this is not the real world, but if you HAD to audition a rig (for purchase) listening to only one acoustic instrument; what instrument would be your lynchpin?
Piano, for me.
Piano, for me.