head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Pure Mechanics
Fast arena-style shooter mixing a scripted Strogg campaign with twitch multiplayer.

Execution · Pure Mechanics
An aerial arena shooter testing twitch piloting and prediction of human dogfighters.
Quake 4 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.
Quake 4
Aimbot plus strafe-jump inputs dominate both campaign and multiplayer
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.
Quake 4
Multiplayer duels reward predicting human positioning and timing
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.
Quake 4
Spawn and item timing add mild uncertainty
Strike Vector EX
Spawns and pickups add minor noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Quake 4
Item control routes and weapon picks are learnable
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.