I've had experience with both T1R's and rainsports.
If I had to pick it would be the t1r's, however they arent the best out there as I mentioned in my previous post.
I had uniroyal rainsports on my clio trophy and tbh, they were useless in the wet and the dry and that was on a good chassis, I can't imagine how crap they will feel on a worse chassis like the
cupra.
Go for the michelins like I said, that little extra spent will be worth it in the long run, both in the dry and the wet.