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
A linear cinematic story with modest shooting and stealth demands.

Execution · Practiced Mastery
Open-world superhero game whose joy is fluid web-swinging and rhythmic combat.
Mafia: The Old Country leans Execution (Practiced Mastery); Marvel's Spider-Man 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.
Mafia: The Old Country
Cover shooting and knife duels need only moderate aim
Marvel's Spider-Man
swinging flow and combat dodge timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mafia: The Old Country
Enemies are scripted encounters in a linear story
Marvel's Spider-Man
thugs and bosses follow fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mafia: The Old Country
Set-piece missions play out the same every run
Marvel's Spider-Man
open world is fully discoverable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mafia: The Old Country
Light stealth routing and resource use, nothing deeply solvable
Marvel's Spider-Man
gadget loadouts and suit mods are 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.