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 · Pure Mechanics
Trilogy capstone whose equal-start arena multiplayer defined a console generation.

Execution · Pure Mechanics
An aerial arena shooter testing twitch piloting and prediction of human dogfighters.
Halo 3 leans Execution (Pure Mechanics); Strike Vector EX 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.
Halo 3
Precision aim and grenade-melee timing
Strike Vector EX
High-speed vector-switching dogfights demand precise aim and control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 3
Equal-start fights reward predicting humans
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.
Halo 3
Equipment pickups and spawn variation
Strike Vector EX
Spawns and pickups add minor noise
Halo 3 leans a little harder on optimization, though the gap is small.
Halo 3
Power-weapon timers and map control
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.