My mind immediately goes to the hierarchy. Wolves, especially in shifter fiction, operate on this strict pack structure. Alpha, beta, omega—it's a social ecosystem. Their conflicts are about territory, loyalty, the internal politics of the den. Werewolves, though? It's often a solitary curse. That internal battle between human self-control and beastly impulse is the core drama. A wolf shifter might struggle to lead, but a werewolf is fighting not to kill their loved ones during a full moon.
Take something like Patricia Briggs's 'Mercy Thompson' series. The werewolves there have a pack too, but the transformation is painful, tied to the moon, and the threat of losing control is ever-present. In contrast, a lot of pure wolf-shifter romance, think 'The Last Wolf' by Maria Vale, focuses on the characters embracing their wolf nature as an integral part of their identity, not a separate, monstrous entity.