When it comes to auto racing F1 is the king. Nascar makes me sick. A bunch of old duffers plowing around in circles. Cart and IRL just don't do it for me anymore. In my opinion the beauty of the int'l road courses, the cutting edge technology and the razor edge driving in F1 cannot be beat. American racing also features too many full course yellows - ruins the race for everyone but the advertisers and networks.
AMA Superbike, World Superbike and the World GP motorcycle racing I also love to watch. For pure racing motorcycles on road courses is awesome. Personally I think the level of skill there surpasses that required in any realm of auto racing.
You?