I ride on streets with giant SUV's and most drivers on cellphones. I also ride some of the twistiest roads in the nation, but they have sand, ice, tourists stopping in the middle of a blind corner to take pictures, deer, elk, dogs, foxes, mountain goats, big horn sheep, marmots, and animals I didn't know what they were. Plus, I don't race on a track.
So I would take the 954 for the torque and some room to move. The 06 RR makes 25 lb/ft at 4K, and the 954 makes 55. The 954 makes over 50 lb/ft from 3,500 to 12,000. The RR makes 45 at 12,000. Not good enough for my type of riding.