Board Thread:Warhammer 40k General Discussion/@comment-86.159.94.118-20150805200234/@comment-26859246-20150806231841

Among the traitor legions only the black legion and the word bearers have any semblance of order and discipline within their ranks.

But as to whether they are more dangerous it's open to conjecture. It did take them 13 attempts to get to the surface of Cadia and now he's trapped there

Can Abaddon and the black legion survive against an attack by at least a dozen space marine strike groups, assassins and whatever the high lords send against him