I'd never be the type who would go to a bullfight, or at least the type that ends in a kill. The other might be very interesting.
I love to watch bullriding. The riders are pretty intense and the bulls are great athletes.
Bullfighting is suspenseful despite the fact that you know the bull will lose. The Mexicans and Spanish have a route on how well the bullfighter does. For a great fight (clean kill with artful moves) the bullfighter gets both ears and a tail. He gets less if less clean and artful.
I spent a lot of time in Texas and have seen bullriding and that seemed to be risky, but not as risky as bullfighting