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

Execution · Pure Mechanics
A fast arena shooter where raw aim and movement meet item-control strategy.
Halo 3 leans Execution (Pure Mechanics); Unreal Tournament 2004 leans Execution (Pure Mechanics).
Unreal Tournament 2004 leans a little harder on execution, though the gap is small.
Halo 3
Precision aim and grenade-melee timing
Unreal Tournament 2004
Aimbot plus perfect dodging trivializes arena duels
Unreal Tournament 2004 leans a little harder on reads, though the gap is small.
Halo 3
Equal-start fights reward predicting humans
Unreal Tournament 2004
Predicting human movement and timing in duels matters
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
Unreal Tournament 2004
Spawns and item timers are knowable, little hidden
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 3
Power-weapon timers and map control
Unreal Tournament 2004
Item timing, map control, and weapon economy are studied
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.