head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Stylish 60s spy FPS mixing stealth routes, gadgets, and gunfights.

Execution · Practiced Mastery
The PS1 third-person espionage shooter following agent Gabe Logan against a viral terror plot.
No One Lives Forever 2: A Spy in H.A.R.M.'s Way leans Execution (Practiced Mastery); Syphon Filter 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.
No One Lives Forever 2: A Spy in H.A.R.M.'s Way
Gunplay and stealth timing through guarded levels
Syphon Filter
Taser duels and headshots under pressure test the hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
No One Lives Forever 2: A Spy in H.A.R.M.'s Way
Guards run scripted patrols and alert states
Syphon Filter
Terrorist AI is scripted spawns and patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
No One Lives Forever 2: A Spy in H.A.R.M.'s Way
First-run patrol uncertainty, then learnable
Syphon Filter
Minor first-run uncertainty in enemy placements
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
No One Lives Forever 2: A Spy in H.A.R.M.'s Way
Gadget use, stealth routing, and skill upgrades
Syphon Filter
Memorizing levels and weapon stashes makes runs routine
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.