At the Speedworld Cup, I ran the same set of tires throughout all qualifying and triple A-mains. I ran 36's with Xenon Red inserts in 19 turn and 36's with Xenon Grey inserts in mod. I was able to turn the same lap times in pretty much every run from 1st to 7th (4 qualifiers and 3 mains each).
Both brands have their place. Take Off's seem to work better in some parking lots and sealed tracks like Ripon. When the weather is cool, CS27's work on every track I've been to. Sorex's, especially 36's, work better in extreme heat for sure. I have not found 1 instance where a CS 32 has worked at all.
TLR, Spektrum, Tekin, SMC, MO-GRIP, www.factory-rc.com https://www.shapeways.com/shops/MPP