Zauriel kind of vacillated in power a lot. In one 'true form', he basically resurrected the earth from destruction, but in a lot of his other showings he got taken out pretty easily. I'd say Doom probably takes it under most circumstances, especially lately where they've been playing up his level of power.
That said, Zauriel HAS defeated someone who had the Dr. Fate helmet/power...
Re: Zauriel vs Dr. Doom
Originally posted by Wild Shadow
ko,kill Cis On. Morality on.Zauriel is sent to stop doom once and for all, Doom is in his castle performing an old demonic ritual when Zauriel interrupts him by breaking through the wall.