432 Hz vs. 440 Hz frequencies: health and psychological effects?
One of the claims that is somewhat easy to validate empirically is that "432 Hz sounds better than 440 Hz." This informal experiment tests this in a straightforward way. People listen to pitch-shifted versions of songs at a variety of different frequencies and rate their preference for the song. Importantly, they don't know which frequency the song has been shifted to.

The results pretty clearly debunk the claim that 432 "sounds better" than 440:



The preference ratings were highest at 440, and there was no statistical difference between 432 and 440.