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

Execution · Pure Mechanics
WWII gunfight execution with light multiplayer prediction.

Execution · Pure Mechanics
High-volume shooting accuracy through chaotic scripted raids.
Call of Duty 3 leans Execution (Pure Mechanics); Delta Force: Black Hawk Down leans Execution (Pure Mechanics).
Delta Force: Black Hawk Down leans a little harder on execution, though the gap is small.
Call of Duty 3
Aimbot trivialises both campaign and multiplayer gunfights
Delta Force: Black Hawk Down
Fast aim against dense hostile crowds is the core 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 3
Multiplayer adds modest human positional prediction
Delta Force: Black Hawk Down
Large multiplayer servers add human positioning play
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
Delta Force: Black Hawk Down
Spawning enemy placements vary slightly between attempts
Delta Force: Black Hawk Down leans a little harder on optimization, though the gap is small.
Call of Duty 3
Map knowledge and weapon choice reward light study
Delta Force: Black Hawk Down
Loadout choice and mission routes 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.