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

Execution · Grand Arena
Movement-heavy modern COD arena shooter.

Execution · Pure Mechanics
An arena shooter built on precision aim and power-weapon map control.
Call of Duty: Black Ops 6 leans Execution (Grand Arena); Halo Infinite leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops 6
Omnimovement raises the aim ceiling
Halo Infinite
Precision aim and strafe duels dominate.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops 6
Slide-cancel duels are pure prediction
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 6
Spawns and SBMM still vary matches
Halo Infinite
Spawn flips and weapon drops add noise.
Call of Duty: Black Ops 6 leans a little harder on optimization, though the gap is small.
Call of Duty: Black Ops 6
Attachment tuning and perk synergy deep
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.