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

Execution · Pure Mechanics
Nine pointer-driven minigames bundled with a Wii Remote, from duck-hunt shooting to table tennis.
Homefront leans Execution (Pure Mechanics); Wii Play leans Execution (Pure Mechanics).
Homefront leans a little harder on execution, though the gap is small.
Homefront
Standard shooter gunplay carries the campaign
Wii Play
Pointer aim and timing carry shooting and ping-pong games
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Homefront
Multiplayer adds some human prediction
Wii Play
Two-player duels add slight mutual 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
Wii Play
Find Mii crowds and target spawns randomise lightly
Homefront leans a little harder on optimization, though the gap is small.
Homefront
Modest loadout and map knowledge layer
Wii Play
Minigames are too shallow to deeply optimise
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.