User blog comment:Thetwindler/Which class of demon is the most powerful?/@comment-1031724-20190325033716

I don't know if there's a definitive answer but it is something to think about.

Princes of Hell have a high status and it's mentioned Lucifer turned them himself. Azazel was king of hell originally. And I'm pretty sure they are stronger than angels (but weaker than archangels). But seeing how he died before angels were introduced, it was kinda hard to place him until the other Princes of Hell were revealed.

White-eyed demons (who I do not believe have been given an official name yet, and we've only see two) must also be powerful, because Lilith was the first demon turned by Lucifer. We're not sure of Alastair's origins, though he must be weaker than Lilith coz it took Sam more power to kill her than him.

Knights of Hell sound like they should be lower than Princes of Hell, but Abaddon was incredibly powerful and they needed the First Blade to kill her.