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
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
Era-typical scripted WWII shooting galleries testing aim and placement memory.
Half-Life 2 leans Execution (Pure Mechanics); Medal of Honor: Rising Sun 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.
Half-Life 2
Gravity gun and shooting demand precision.
Medal of Honor: Rising Sun
Aim against scripted soldier placements is the core demand
Medal of Honor: Rising Sun leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Medal of Honor: Rising Sun
Multiplayer adds light human prediction; campaign AI is static
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Medal of Honor: Rising Sun
Setpiece missions replay identically
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Linear progression with no builds.
Medal of Honor: Rising Sun
Memorising enemy placements and routes is shallow but present
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.