Uh.. Ive read up on this shit and there were 15 mill people taken on the slave ships and aprox' half of them died..

Below is a list of the death toll. for hollocaust

# Between five and six million Jews
# More than three million Soviet prisoners of war
# More than two million Soviet civilians
# More than one million Polish civilians
# More than one million Yugoslav civilians
# About 70,000 men, women and children with mental and physical handicaps
# More than 200,000 gipsies
# Unknown numbers of political prisoners, resistance fighters, homosexuals and deportees

*edit* I just read your last post and I think The slave ships were less moral due to the fact that there was more people responsible for them. But its hard too judge which was more immoral because they both singled out people just for being different.