I have Pirelli P400 touring on my '93 and Pirelli P Zero Nero on the '03.
Dry and wet traction is awesome with both tires.
Snow on the P400 would probably be good if they weren't bald due to my very heavy foot
Snow on the P Zero Nero is not great either. They are rated as a M&* tire, but much more then a few inches and they don't get much grip. While they are tollerable for sure, there are much better choices for an all around tire I think. I do really like this tire overall though. Cheap, great grip, good looks.