I think the best way to go is for a documentary. They tend to follow the facts and show more of what I'm interested in. Documentaries are also a good way to learn things about the sport that I did not previously know. A movie about racing will always be less than the real thing and not a true representation. It's too easy to notice the shortcomings and inaccuracies, which detracts from the film experience. Better yet, why not go and see a race in person??