Ballistic greens & Schumacher Greens are the 2 popular wet tyres...Schumacher Silvers were apparently the tyre of choice in the wet at Eden Park National this year, but that's the only place I've heard them work!
Ballistics are softer than the Schumachers, and have longer spikes that deflect more probably giving more contact area or something perhaps?!?!?...but there's more to it than the hardness...it's got a lot to do with the actual rubber compound too...
I think the truth really is that there is very little grip in the wet, no matter what tyre you run...although one thing is for sure...Schumacher yellows do not work at all!!!
At every wet race I've ever been to, some prefer one over the other, and some prefer the opposite...so whatever works for you really, I suspect to the top 10 drivers who can feel the odd 1/10th of the second here or there on track it probably does matter, but as an average driver I've rarely felt enough difference back to back to worry.
So I tend now to stick to the ballistics in the wet...they work well enough, and also work ok in the dry too...so are a good balance for wet and drying conditions. In totally dry conditions they are are slightly safer than schumacher yellows as they have a bit more give (due to the longer spikes)...and at RHR national this year they were the choice tyre in the dry as they gave a better balance of grip on the two types of astro they have there.
Also, in my experience the compound of rubber used on the Schumacher greens goes off over time, hardening the rubber further and rendering the tyres useless after while...so they don't work if kept lying around in your pit box. Ballistics don't seem to do this.
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