The best drivers in the world have all come from open cockpit racing.
I have a friend who owns a racing team-his father in-law is Felix Sabatos. He said it is pretty much common knowledge the best drivers in the NASCAR circuit have come from open cockpits racing- Tony Stewart and Robbie Gordon. They drive their cars to hard according to him, but they are the very best drivers in the world. You formula one drivers are probably even better than them.