Who's the bigger lawless vigilante tyrant?

As explained in Ghost Rider #77 (1973 series), the physical, stone body of the demon Zarathos had lain inert and inanimate beneath the earth for eons until his spirit was summoned by a Native American tribal sorcerer named K'Nutu to help his tribe. Zarathos was then offered a steady supply of souls to consume in exchange for his aid in vanquishing enemies of the sorcerer's tribe, and for offering his might in their service. This alliance proves mutually beneficial, flourishes and a strong cult builds up around Zarathos, which gets the attention of Mephisto, who decides that Zarathos has too much of a following and is depriving him and the other Lords of Hell of souls. Mephisto eventually confronts Zarathos and defeats him (by the deceptive use of his soulless pawn, Centurious).

Zarathos is then forced to serve Mephisto for many centuries in the Netherworld, an extra-dimensional land of the dead sometimes called "Hell", though still powerful enough to avoid total confinement. Mephisto sends his unruly vassal back to Earth on occasion, binding him to human hosts and allowing him to ravage souls (on a smaller scale). In modern times, Zarathos is bound to Johnny Blaze; the combined Blaze/Zarathos entity manifests as a leather-clad flaming skeleton known as the Ghost Rider, ultimately serving the side of "good" while still using hellish means, which earns the Ghost Rider a reputation of fear and Johnny Blaze a never-ending sense of guilt.