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 · Competitive PvP
Blockbuster 2009 sequel famous for killstreak chains and frantic multiplayer.

Execution · Pure Mechanics
A fast arena shooter where raw aim and movement meet item-control strategy.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Unreal Tournament 2004 leans Execution (Pure Mechanics).
Unreal Tournament 2004 leans a little harder on execution, though the gap is small.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
Unreal Tournament 2004
Aimbot plus perfect dodging trivializes arena duels
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Unreal Tournament 2004
Predicting human movement and timing in duels matters
Call of Duty: Modern Warfare 2 leans a little harder on variance, though the gap is small.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
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.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
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.