I'm glad I went with the PSS. They definitely had more grip then my NT05. Driving in those conditions was pretty interesting.
Here's a video from my last session on the track. I was too chicken to try the 'aggressive' rain line I was shown - I couldn't judge the braking area properly because it crossed the dry racing line, and so you would get grip, lose it and gain it again after crossing the line. So I pretty much just tried to stay inside of the dry line where I could get grip.