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 · Practiced Mastery
A gritty WWII Call of Duty that introduced the Zombies mode.

Execution · Practiced Mastery
A soccer game testing on-ball execution and tactical opponent prediction.
Call of Duty: World at War leans Execution (Practiced Mastery); ESPN MLS ExtraTime 2002 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: World at War
Twitch gunfights in fast multiplayer lobbies
ESPN MLS ExtraTime 2002
Passing, shooting and dribbling timing carry play
ESPN MLS ExtraTime 2002 leans a little harder on reads, though the gap is small.
Call of Duty: World at War
Human opponents reward positioning prediction
ESPN MLS ExtraTime 2002
Predicting human opponents' positioning and passes matters
Call of Duty: World at War leans a little harder on variance, though the gap is small.
Call of Duty: World at War
Random lobbies, spawns, and zombie waves
ESPN MLS ExtraTime 2002
Minor deflection and bounce 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: World at War
Perk loadouts and map control are learnable
ESPN MLS ExtraTime 2002
Formations, set pieces and tactics are learnable
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.