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
Fast arena-style shooter mixing a scripted Strogg campaign with twitch multiplayer.

Execution · Pure Mechanics
Classic WWII shooter whose objective-based multiplayer defined a genre.
Quake 4 leans Execution (Pure Mechanics); Return to Castle Wolfenstein 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
Return to Castle Wolfenstein
Fast strafing and precise hitscan aim dominate duels
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
Return to Castle Wolfenstein
Multiplayer objective pushes hinge on outguessing human defense
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
Return to Castle Wolfenstein
Fixed objectives and scripted singleplayer enemies, little randomness
Return to Castle Wolfenstein leans a little harder on optimization, though the gap is small.
Quake 4
Item control routes and weapon picks are learnable
Return to Castle Wolfenstein
Objective timings, class roles, and routes reward planning
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.