head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Execution · Pure Mechanics
Party-sized motion-timing contests with learnable per-event techniques.
Homefront leans Execution (Pure Mechanics); Mario & Sonic at the Olympic Winter Games 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
Mario & Sonic at the Olympic Winter Games
Motion-timing and button precision decide every event
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
Mario & Sonic at the Olympic Winter Games
Local human rivals add mild prediction in head-to-head events
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
Mario & Sonic at the Olympic Winter Games
Events are fixed; minor physics wobble
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
Mario & Sonic at the Olympic Winter Games
Each event has a learnable optimal technique
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.