User blog comment:General MGD 109/Who's the strongest demon/@comment-108.20.0.219-20140118224941

If you look up Demon ranking it goes    Lilith the 1st demon and  the  Alastair than Azazel

It also mentions a  demon ranking by eye color

White eye   1st      They are on Lucifier's  board of hmm Directors

Yellow eye  2st      These would be the  Generals

Red eye     3st       These are the Deal makers

Black eye  4th        These are the foot soldiers

In the case of  Abbaddon even through she is a black eye demon she was specially trained

by  Lucifier to be a Knight of Hell. So hmm she could be as powerful as a  yellow eyed demon