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

Execution · Pure Mechanics
A tactical military shooter where aim against human opponents is the deciding factor.

Execution · Pure Mechanics
Classic arena aim married to champion abilities, tested against adaptive human opponents in fast duel maps.
Call of Duty: Modern Warfare leans Execution (Pure Mechanics); Quake Champions 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
aim and reflexes decide engagements
Quake Champions
Champion abilities add execution layers on top of classic rail and rocket aim
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
predicting human opponents' positioning
Quake Champions
Human duels require reading opponent ability usage and positioning
Quake Champions leans a little harder on variance, though the gap is small.
Call of Duty: Modern Warfare
spawns and loadout drops vary
Quake Champions
Ability cooldowns introduce mild timing uncertainty per match
Quake Champions leans a little harder on optimization, though the gap is small.
Call of Duty: Modern Warfare
loadouts and map knowledge solvable
Quake Champions
Champion matchup knowledge and item timing are solvable advantages
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.