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
A heavyweight sci-fi FPS pitting ISA soldiers against the Helghast with famously weighty gunfeel.

Execution · Pure Mechanics
WWII shooter remembered for its Omaha Beach landing and tense rifle duels.
Killzone 2 leans Execution (Pure Mechanics); Medal of Honor: Allied Assault leans Execution (Pure Mechanics).
Killzone 2 leans a little harder on execution, though the gap is small.
Killzone 2
Weighty gunplay punishes imprecise aim hard
Medal of Honor: Allied Assault
classic FPS aim, leaning, and sniping
Killzone 2 leans a little harder on reads, though the gap is small.
Killzone 2
Multiplayer opponents adapt; campaign AI doesn't
Medal of Honor: Allied Assault
historic multiplayer scene rewarded outguessing humans
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Killzone 2
Modest spawn and objective rotation noise
Medal of Honor: Allied Assault
scripted ambushes surprise only once
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Killzone 2
Class unlocks and map control are learnable
Medal of Honor: Allied Assault
encounter memorization, especially Omaha Beach
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.