He'd have killed good or bad depending solely on who hired him.
Sasuke on the other hand has the intellect, the calm collective thing, and he does nothing but feel sorry for himself and wants to blame everyone else for his pitiful childhood.
I don't think that's actually what he's doing at all. Sasuke's avenging his clan still. He does nothing but think about restoring his clan's honor by killing those he feels are responsible and those in the way. He's not really a pity party at all. He seems too active for it.