I think Kel'Thuzad would likely win because he knew vastly more about Arthas's own powers than Arthas himself did. In fact, everything Death Knight Arthas knew was because KT told him to begin with. His knowledge about the Lich King, Frostmourne, and necromancy surpassed that of the dreadlords, the very beings who aided in the Lich King's creation and oversaw him. Given this, I'm relatively confident he could devise a way to defeat him.
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