head to head
Halo Wars asks more than Call of War, and the gap is execution.

Optimization · Mind & Math
A slow WW2 grand-strategy of economy management against scheming human nations.

Optimization · Mind & Math
Console-first RTS translating Halo's factions into streamlined base-and-army battles.
Call of War leans Optimization (Mind & Math); Halo Wars leans Optimization (Mind & Math).
Halo Wars leans clearly harder on execution.
Call of War
Issuing orders is trivial; no twitch dimension
Halo Wars
Controller macro is deliberately light
Call of War leans a little harder on reads, though the gap is small.
Call of War
Human players form alliances and bluff in real time
Halo Wars
Versus humans, build choices are mindgames
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of War
Fog of war hides enemy unit positions and plans
Halo Wars
Scouting hides enemy composition early
Call of War leans a little harder on optimization, though the gap is small.
Call of War
Economy, research and unit composition decide the war
Halo Wars
Build orders and counter-unit economy
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.