User blog comment:DirgeOfCerberus111/Adeptus Custodes Vs. Grey Knights/@comment-2253300-20110819114042/@comment-2253300-20110819124402

Yes, but the ferocity of the Grey Knights is something that rivals if not surpasses that of the Custodes. The Grey Knights have proven themselves again and again against serious odds, where the Custodes have not fought that much for the 10'000 years that the Emperor has been on the Throne. Both on an individual level and as a military forces I would put the Grey Knights in first place.