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 · Practiced Mastery
Alternate-history alien-invasion shooter known for its inventive Chimeran arsenal.
Homefront leans Execution (Pure Mechanics); Resistance: Fall of Man leans Execution (Practiced Mastery).
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
Resistance: Fall of Man
Aim and weapon handling against Chimera hordes.
Resistance: Fall of Man leans a little harder on reads, though the gap is small.
Homefront
Multiplayer adds some human prediction
Resistance: Fall of Man
Sizable competitive multiplayer added genuine human opposition.
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
Resistance: Fall of Man
Campaign unknowns on first pass.
Resistance: Fall of Man leans a little harder on optimization, though the gap is small.
Homefront
Modest loadout and map knowledge layer
Resistance: Fall of Man
Exotic weapon selection per encounter rewards system knowledge.
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.