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
Treyarch's future-tech Call of Duty that anchored competitive console FPS.

Execution · Pure Mechanics
An arena shooter built on precision aim and power-weapon map control.
Call of Duty: Black Ops II leans Execution (Pure Mechanics); Halo Infinite leans Execution (Pure Mechanics).
Halo Infinite leans a little harder on execution, though the gap is small.
Call of Duty: Black Ops II
Snap aim and movement speed decide split-second gunfights
Halo Infinite
Precision aim and strafe duels dominate.
Halo Infinite leans a little harder on reads, though the gap is small.
Call of Duty: Black Ops II
Human lobbies adapt rotations; pros mind-game spawns
Halo Infinite
Adaptive opponents around power weapon timings.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops II
Spawn flips and scorestreak chaos inject randomness
Halo Infinite
Spawn flips and weapon drops add 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: Black Ops II
Pick-10 classes and streak economies reward optimization
Halo Infinite
Map control, weapon timers, and team callouts.
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.