Deus Ex Machina vs Skynet
At a certain point in time both of these A.I.'s more or less had control over Earth. Both at their prime they face off, DEM with millions of Sentinels and Skynet with it's countless Terminators and Hunter-Killers.
We know that 250.000 Sentinels attacked Zion, but its not known what the exact numbers of the army are. Let's say each army consists of 500k "soldiers" with in the case of Skynet the amount of tank/airplane and other non-humanoid Hunter Killers in relation to humanoïd Terminators is similar to our amounts of artillery and planes/choppers in relation to Infantry.
Who would win? Hacking is not allowed but the DEM and Skynet do decide on strategy and actions.