head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
A fast-paced military shooter where twitch aim against other players is the core test.

Execution · Pure Mechanics
An aerial arena shooter testing twitch piloting and prediction of human dogfighters.
Call of Duty: Modern Warfare 3 leans Execution (Pure Mechanics); Strike Vector EX leans Execution (Pure Mechanics).
Call of Duty: Modern Warfare 3 leans a little harder on execution, though the gap is small.
Call of Duty: Modern Warfare 3
aim and reflexes decide most engagements
Strike Vector EX
High-speed vector-switching dogfights demand precise aim and control
Call of Duty: Modern Warfare 3 leans a little harder on reads, though the gap is small.
Call of Duty: Modern Warfare 3
predicting human opponent positioning and habits
Strike Vector EX
Predicting human pilots' transform timing wins duels
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 3
spawn placement and loadout drops vary
Strike Vector EX
Spawns and pickups add minor noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 3
loadout tuning and map knowledge help
Strike Vector EX
Loadout counters and map knowledge sit underneath
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.