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 · Pure Mechanics
WWII gunfight execution with light multiplayer prediction.

Execution · Competitive PvP
A class-based shooter testing approachable aim and counter-picking against human teams.
Call of Duty 3 leans Execution (Pure Mechanics); Plants vs. Zombies: Garden Warfare leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty 3
Aimbot trivialises both campaign and multiplayer gunfights
Plants vs. Zombies: Garden Warfare
Third-person aim and ability timing carry every fight
Plants vs. Zombies: Garden Warfare leans a little harder on reads, though the gap is small.
Call of Duty 3
Multiplayer adds modest human positional prediction
Plants vs. Zombies: Garden Warfare
Human opponents flank and juke in class-based skirmishes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty 3
Scripted setpieces and spawn flow add minor unknowns
Plants vs. Zombies: Garden Warfare
Sticker pack unlocks randomise progression, not matches
Plants vs. Zombies: Garden Warfare leans a little harder on optimization, though the gap is small.
Call of Duty 3
Map knowledge and weapon choice reward light study
Plants vs. Zombies: Garden Warfare
Class counters and objective timing reward team 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.