they are relatively on par with each other,, since both of their arsenal is revolved around elemental attacks,,,,,
however,, hiruzen would win this battle mainly due to enma,,,,
--All the elemmental attacks are comparable for both of them however with hiiruzen being an edo here,, means thhat he can use them for longer periods of time,,
--Kakuzus Domu defense is overcomed by hiruzens enma shield and since it can extend itself,, it allows hiruzen to attack kakuzu effectively in mid/long range as well,,,