Hellrider > Hero of Oxid Ridge >> Battledriver
Hellrider and Oxid are very similar cards. Hellrider is better at pushing damage through big blockers, and Oxid is better at pushing damage through small blockers. The prevalence of big blockers and the greater consistency give Hellrider the nod.
I don't see Battledriver as an aggro curve topper at all, since it does nothing the turn you play it. It's really a midgame setup card for the tokens deck, much like Purphoros. In that deck, Battledriver is often better, but it's playing a different role.