F1 when I can. Used to watch all the world rally racing I could find, but I haven't seen it on for a year or two. Just something about haulling a** down a road (ice, dirt, pavement) where you can't see past the next corner, car sideways most of the time and trusting your navigator to get you to the end of the course (or on the flip side, navigating and putting your trust in the driver not to kill both of you).
Mind blowing what the F1 can do on pavement and what the rally cars can do on not pavement!!