head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Practiced Mastery
A spy shooter testing console aim and learning each mission's intended route.
Half-Life 2 leans Execution (Pure Mechanics); James Bond 007: Agent Under Fire 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.
Half-Life 2
Gravity gun and shooting demand precision.
James Bond 007: Agent Under Fire
Console FPS aim and rail-shooter timing carry missions
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
James Bond 007: Agent Under Fire
Split-screen friends add mild prediction; campaign AI is scripted
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.
James Bond 007: Agent Under Fire
Missions play out identically each attempt
James Bond 007: Agent Under Fire leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
James Bond 007: Agent Under Fire
Gadget usage and stealth routes raise mission ratings
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.