Until sameerrao came along with his excellent post I wondered why Nuvolari wasn't mentioned. He definately belongs up there.
I'm not going to pick a winner though. It's impossible to compare them. What I can do is name a couple of what I think are the greatest drivers ever. In that case I come up with Tazio Nuvolari, Juan Manuel Fangio, Jackie Stewart, Stirling Moss, Ayrton Senna and Michael Schumacher.
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