I saw the World of Outlaws run at Skagit Speedway in Washington state several years ago. Amazing car handling. You get real dirty by the end of the evening. You could feel the fine dirt hit you every single lap. I'm sure those giant wings had a lot to do with that.
F1 bores the heck out of me, I'd much rather watch Indy car races when it comes to open wheeled cars. Sad that it got so screwed up a few years back, when CART had a falling out with the Georges.
I watch NASCAR pretty regularly, but the constant rule changes are really messing with the racing compared to what it used to be. Mandatory cautions, several stages to a race. The lucky dog (free pass), and the wave around rules, have messed with what was real racing. In what other car racing can you get back on the lead lap, when you are a lap down, simple because a caution is called?
I watch NHRA, but really only like the 1/4 mile strips. Some cars just do better on the big end, and I think the 1/8th mile penalizes them.
My favorites are any class of sports car and GT racing, road courses preferred over street courses.
I enjoy the Australia Supercars Championship series. Some kickass Mustangs run in that exciting to watch series. Of course the Trans-Am series, which is kind of our version of the Supercar series.
Trans Am - America's Road Racing Series
gotransam.com