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.

Optimization · Practiced Mastery
A portable Metal Gear pairing mission stealth with a base-building development metagame.

Optimization · Pure Optimization
A tower-defense action game about optimizing trap layouts against orc waves.
Metal Gear Solid: Peace Walker leans Optimization (Practiced Mastery); Orcs Must Die! Deathtrap leans Optimization (Pure Optimization).
Metal Gear Solid: Peace Walker leans a little harder on execution, though the gap is small.
Metal Gear Solid: Peace Walker
Boss vehicle fights and CQC chains test aim and timing.
Orcs Must Die! Deathtrap
aiming traps and weapons under waves
Metal Gear Solid: Peace Walker leans a little harder on reads, though the gap is small.
Metal Gear Solid: Peace Walker
Enemy AI is scripted and predictable.
Orcs Must Die! Deathtrap
scripted orc waves, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Solid: Peace Walker
Missions are fixed; soldier recruitment adds slight randomness.
Orcs Must Die! Deathtrap
wave composition randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Solid: Peace Walker
Mother Base management and weapon development are pure systems.
Orcs Must Die! Deathtrap
trap layout and co-op build optimization
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.