I was searching for a new set of tyres to replace the P6000s that my car came with and found this article. The entire article is too large to be uploaded so I've provided the title in full above. If you want to read the full article, just do a yahoo search based on the above. It's a pdf file. I've attached the results.
Guess if noise level is the concern, this study is as objective as they come.
tyrenoise.pdf