User blog comment:Edrea/Is Morgana more powerful than Merlin?/@comment-4495575-20130629080621/@comment-10341849-20130629133130

Yes, ageing spell did make both of them exhausted, but if there was a clue that Merlin IS more powerful than Morgana, in episode With All My Heart, Merlin after disguised into old woman, he still can released Guinevere from Morgana's spell. Even after he told Gaius it was almost impossible to do it, because it required powerful magic and if he had to do it together with the ageing spell, the chance it will succeeded was slim. In the end, he still succeeded, that means he IS more powerful than Morgana.