You know how the cartoon/etc always have Wolverine not use his claws for evisceration? Well, Group A consists of people who Wolverine HAS gotten the chance to damage with his claws, and ONLY those he has actually harmed/scarred.
Group B, however, are the resurrected souls of people who Superman or Batman have killed. However, these only those who the two crusaders have killed out of ANGER or VENGEANCE, not someone who was just caught in the crossfire or died of their own accord/fault.
Bonus: Which group do you think is larger?