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
Routine shooter aim through scripted cartel firefights.

Execution · Pure Mechanics
Linear military FPS about resisting an occupation of the United States.
Call of Juarez: The Cartel leans Execution (Pure Mechanics); Homefront 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 Juarez: The Cartel
Standard FPS gunfights run on aim alone
Homefront
Standard shooter gunplay carries the campaign
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: The Cartel
Co-op secret objectives add mild teammate suspicion
Homefront
Multiplayer adds some human prediction
Homefront leans a little harder on variance, though the gap is small.
Call of Juarez: The Cartel
Enemy waves spawn identically each run
Homefront
Scripted setpieces, little randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: The Cartel
Weapon levelling is a thin progression layer
Homefront
Modest loadout and map knowledge layer
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.