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 · Practiced Mastery
The PS1 third-person espionage shooter following agent Gabe Logan against a viral terror plot.

Optimization · Practiced Mastery
An open-world action game where hacking the city's infrastructure is your main weapon.
Syphon Filter leans Execution (Practiced Mastery); Watch Dogs leans Optimization (Practiced Mastery).
Syphon Filter leans a little harder on execution, though the gap is small.
Syphon Filter
Taser duels and headshots under pressure test the hands
Watch Dogs
Cover shooting and driving at modest difficulty
Watch Dogs leans a little harder on reads, though the gap is small.
Syphon Filter
Terrorist AI is scripted spawns and patterns
Watch Dogs
Online invasions add a small human element
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Syphon Filter
Minor first-run uncertainty in enemy placements
Watch Dogs
Guard placements are knowable on approach
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Syphon Filter
Memorizing levels and weapon stashes makes runs routine
Watch Dogs
Hacking chains and camera routes make stealth solvable
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.