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 · Pure Mechanics
Linear military FPS about resisting an occupation of the United States.

Execution · Pure Mechanics
Arcade soccer testing reflex tackles and super-shot timing.
Homefront leans Execution (Pure Mechanics); Nintendo World Cup 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.
Homefront
Standard shooter gunplay carries the campaign
Nintendo World Cup
Tackles and super-shot timing decide most goals
Nintendo World Cup leans a little harder on reads, though the gap is small.
Homefront
Multiplayer adds some human prediction
Nintendo World Cup
Versus a human, shot fakes add light prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Homefront
Scripted setpieces, little randomness
Nintendo World Cup
Ball physics add minor chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Homefront
Modest loadout and map knowledge layer
Nintendo World Cup
Learning super-move triggers is a small solvable 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.