Hiruzen wins..
People are either forgetting or underestimating how useful enma would be in this situation.
1.Hiruko will instantly be destroyed by enma
2. I don't see how a magnetic based attack like iron sand will be a problem for hiruzen when he is more than capable of using S and A ranked fire jutsu. Heating a magnet makes it lose its magnetic force which wuld make iron sand useless... 2 shadow clones using a katon the size of the one in my sig, should be more than enough to demagnetize and destroy 3rd kazekage puppet.
3. Enma effortlessly wreaks the rest of the puppets without getting poisoned, due to being indestructible.
4. Hiruzen has any counter to any element sasori has.
Once again the 3rd hokage is being underrated. But im confident he could win with Mid -High Diff.