Board Thread:Warhammer 40k General Discussion/@comment-108.51.155.155-20131208175717/@comment-6078851-20131218002638

while abaddon isn't horus' equal, or superior, in terms of (natural) ability or intellect, horus lead one campaign over a few years (which ended with his own death) while abaddon's lead 13(?) campaigns to date, as well as lead his forces for near 10,000 years.

on paper that kinda makes abaddon waaay more successful.