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 tense sci-fi shooter where asymmetric species combat rewards aim and positioning.

Execution · Pure Mechanics
WWII gunfight execution with light multiplayer prediction.
Aliens vs. Predator leans Execution (Practiced Mastery); Call of Duty 3 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.
Aliens vs. Predator
aim and melee timing across species
Call of Duty 3
Aimbot trivialises both campaign and multiplayer gunfights
Call of Duty 3 leans a little harder on reads, though the gap is small.
Aliens vs. Predator
human opponents in multiplayer modes
Call of Duty 3
Multiplayer adds modest human positional prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Aliens vs. Predator
enemy spawns and drops vary
Call of Duty 3
Scripted setpieces and spawn flow add minor unknowns
Aliens vs. Predator leans a little harder on optimization, though the gap is small.
Aliens vs. Predator
class abilities and routes solvable
Call of Duty 3
Map knowledge and weapon choice reward light study
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.