__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
Based on implied power? The Ancient One. It's implied in Dr Strange that she spent centuries dealing with magical cosmic threats.
Based on available feats? Agatha, unless the Ancient One decides to take it to the Mirror Dimension, in which case Agatha probably gets squashed by a building. People hype Agatha for what she did with Wanda, but she had to use prep that stripped Wanda of her powers and hostages to gain the upper hand.
__________________ Never take life seriously. Nobody gets out alive anyway.
Unless there's prep involved, Ancient One wins. Right now we haven't really seen anything too impressive from Agatha combatwise. This might change by next Friday.
__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk