Tell me who would win and why.

Bitch please, Zhaitan will fuck them both up

Killed a bunch of dwarves? Lol Zhaitan eats dwarves civilizations for breakfast every morning. Can do fancy shouts and enslaves humanity? This motherfucker has done all that too without ever leaving his couch

Interesting question. I feel like Smaug would definitely win because to defeat him I believe the characters in The Hobbit needed a special type of arrow or bolt because no other weapon would scathe him. I'm not too sure what it was, I haven't seen The Hobbit movies in years, but I know he was very difficult to kill. Not even molten lava harmed him. In Alduin's case, all you need are your own weapons and spells and a couple of other Dragonborn. He's not really that difficult to kill in my opinion. I think Smaug could take Alduin down easily.

me bc the hero always slays the dragon