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
A fast-paced military shooter where twitch aim against other players is the core test.

Execution · Pure Mechanics
Tactical shooting where your real hands aim, reload, and out-duel adapting humans.
Call of Duty: Modern Warfare 3 leans Execution (Pure Mechanics); Pavlov VR 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 3
aim and reflexes decide most engagements
Pavlov VR
Physical aim plus manual reloading in VR is a literal hands test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 3
predicting human opponent positioning and habits
Pavlov VR
Human opponents fake, peek and adapt every round
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 3
spawn placement and loadout drops vary
Pavlov VR
Spawn and gunfight chaos add modest noise
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 3
loadout tuning and map knowledge help
Pavlov VR
Buy economy and site strategy mirror tactical-shooter 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.