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

Optimization · Practiced Mastery
An open-world crime game where Tony Montana rebuilds his Miami drug empire from nothing.

Optimization · Practiced Mastery
An open-world action game where hacking the city's infrastructure is your main weapon.
Scarface: The World Is Yours leans Optimization (Practiced Mastery); Watch Dogs leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Scarface: The World Is Yours
Shootouts and rage-mode management need steady aim
Watch Dogs
Cover shooting and driving at modest difficulty
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Scarface: The World Is Yours
Gangs and cops follow scripted heat responses
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.
Scarface: The World Is Yours
Drug-deal minigame and cop heat add mild randomness
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.
Scarface: The World Is Yours
The cocaine distribution economy is the real game
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.