432HZ >> For me it sounds better, more natural, doesn't require as much Volume as with 440HZ. Some musicians believe in it, some don't. I do!

Here is a youtube video called Cymatics Frequency Experience. The shape that the sand particles pick up with 432 HZ are much nicer than the 440HZ.

https://www.youtube.com/watch?v=wE6A3rmuet0&ab_channel=thisWorldisBeautiful