User blog comment:NaiflidG/Relating to Alastair in "On the Head of a Pin" and "Caged Heat"/@comment-104.167.139.175-20141120171010

Same eye color does not always mean equal strength, and it's canon that Lilith is much stronger than Alastair (which is sure saying something!). I think Azazel is probably around equal in strength to white-eyed demons. Honestly I think most evidence points to him being more powerful than Alastair, but less so than Lilith. The reason I think this is because holy water seems to work on all except the strongest.