Well, that's exactly why we keep a database of Survey Results.
When our customers make a purchase, we kindly ask them to fill out a short survey documenting tire performance in the real world. In other words, it helps us determine which tires are top-sellers, and which tires are falling short—which, in turn, helps you make comparisons during the purchasing process.
For example, after navigating to the Pirelli PZero page, you'll click on "Survey" which pulls up a chart. You'll see that as of right now, the P Zero tires are ranked a strong #5 out of 30 other Max Performance Summer tires. (See complete chart.)
Reading even closer, you'll see how they compare in terms of wet and dry traction, noise comfort and more. Make note, however, that this information can and sometimes does change on a daily basis—that's only because we're constantly getting in new Survey Results from drivers just like you.