these two on a team would just be frightening. magnetite negates the use of enma's adamantine staff form. magnetite would also probably shrug off tsunades punches. sasoris quite safe. furthermore tsunade lacks sakuras antidote and knowledge of sasori via chiyo that sakura had. one scratch and its over for both.
hiruzen is still very strong but fighting these kinds of stationary yet still long range defensive and offensive types is bad for his jutsu set. tsunades lighting attack is useless because sasoris body doesnt have nerves.
katsuyu would probably get restrained by sand immediately after being summoned. 4th kazekage commented gaaras sand restraining power is stronger than that of shukaku.
world method is probably the best counter for hiruzens adamantine cage being that the spikes would penetrate through the gaps. but hell its sand. a cage wont be saving him. nor will a weak ass mud wall. not against magnetite spikes.
The Sand wins this with only mid difficulty. Both Gaara and Sasori have a slim chance of soloing as well.
IMO both members of Team Sand are superior to either member in Team Hokages. Gaara can bury Tsunade and proceed to crush her to seal her or until she get crushed into bits.
Old Hiruzen isn't much of a threat because of his slow speed and slow stamina. He'd probably get poisoned by Sasori and then die.
Easily the sand. Gaara just tsunamis and its over. Watch the trailer for the movie "Tsunami", it can devastate an entire city, let alone two people. Look how japan is right now after the tsunami almost two years ago. And sand is denser than water.