My Dad was a pro. Piano player and piano tuner. I have been tuning pianos for the last 60 years. After tuning a $70,000 Steinway I had the opportunity to tune a $125,000 Bosendorfer (spelling?) I thought the Steinway had a better sound.
My point, the best piano sound is what sounds best to you. My preference is full round mellow sound.
Keep searching/creating for a piano that sounds good to you, John C
While working at the Steinway dealer in the 70s I remember being told that Steinway Hall in NYC had an area with concert grands where a visiting artist in town to play a concert could choose the concert grand that most appealed to them.
Your point is well taken the best piano sound is what sounds best to you.