Not much distinction. The only good animal comparison I can make is parasites vs. predators. Many people like predators (see frog), but parasites are generally reviled. Is it the honesty of the predator, the increased complexity selection, or the fact that we're predators?
Perhaps we could compare both forms of slavery to parasitism. Anyway, those of us woke to the PQ understand that predators are still exploiting the efforts of the noble herbivores.