Kakuzu wins this
--Danzo is not outlasting him, nor are his fuutons doing anything whatsoever when kakuzu has the domu durability as well as his katons to turn them against danzo
--Baku gets lit up to flames by Kakuzus katons,therefore leaving danzo completely out of options to attack him
--CQC is advantageous for kakuzu as well, when he has his threads to over whelm danzo added with domu durability and hard skin enhancing the power of his attacks even more, thus crushing him just how susanoo did in canon
--Kakuzu then proceeds to use his multiple hearts to overwhelm danzo with ease, as once he runs out of izanagi, he dies,