head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Execution · Pure Mechanics
Classic WWII shooter whose objective-based multiplayer defined a genre.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); 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.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
Return to Castle Wolfenstein
Fast strafing and precise hitscan aim dominate duels
Call of Duty: Modern Warfare 2 leans a little harder on reads, though the gap is small.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Return to Castle Wolfenstein
Multiplayer objective pushes hinge on outguessing human defense
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
Return to Castle Wolfenstein
Fixed objectives and scripted singleplayer enemies, little randomness
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
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.