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Take it from me. I was in your exact position just a month ago.
I had PSS on my 20" LMs and was pretty impressed. They felt very similar to my 19" PS2s, however cornering wasn't overly impressive.
Fast forward to now....I put in a S/C and wanted to lose some unsprung weight -- I switched to 19" HRE Monoblocks and needed to choose between AD08 or PSS for my tire.
Due to the stiffer sidewall, more square stance, and better dry grip, I went with the AD08s and I havn't looked back.
People say the AD08's are noisy - As someone who would generally notice a noise difference (if it was a big difference), I literally hear no difference, whether driving with windows up or down. Now I'm sure there MUST be a difference because everyone says the AD08's are louder.....but to be honest, they sound so similar that I wouldn't even mention noise when comparing them. They're certainly not loud to the point where they are overbearing or annoying. Then again I do have an Eisenmann Race exhaust so that could be overtaking the noise of the tires.
The stiffer sidewall was noticed immediately, as the car felt incredibly balanced and my turn-ins were razor sharp. Add to that the fact that the ride wasn't harsher due to the stiffer sidewall, and I was surprisingly impressed! I went with big tires (295) in the rear and front (265), and I couldn't be happier.
If you're not tracking the car, I wouldn't worry as much about rain performance OR tread life, as the only places these things will be more pronounced is if you use them on the track.
So to me, it came down to weight. The PSS weigh considerably less than the AD08 (2-4lb less), and to me that is the biggest advantage. While you may be pressed to actually notice the weight difference while driving, just the knowledge of having the least amount of unsprung weight as possible is confidence-inspiring.
So, if you're a weight-nut and want to be able to brag about having the lowest possible unsprung weight, go with the PSS. If you are really worried about hydroplaning as your cruising down the highway, go with the PSS.
If you want maximum dry grip and a meaty, monstrous looking tire, go with the AD08. Either way you can't go wrong!
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