I've listened, or tried to use, all the kinds, white, pink, brown, purple etc...and usually afterward T was slightly louder or bothersome. Not sure the reason though. From what I feel and sense, my ears prefer a more targeted range of frequencies. I did make some passthrough noise samples, like 5500-6500 Hz and utilized I think pink or purple noise, but there is very little fall off of power/intensity in that small of a range (so could have used white). Haven't used those sounds in a long time.