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
Open-world western about an outlaw forced to hunt down his old gang.

Execution · Practiced Mastery
Cinematic survival action where scavenged resources and stealth carry you through the apocalypse.
Red Dead Redemption leans Execution (Practiced Mastery); The Last of Us 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.
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
The Last of Us
Aim, stealth timing, and scarce-ammo combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption
Multiplayer skirmishes add light human prediction
The Last of Us
Enemy AI searches but follows mappable routines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption
Ambient events and spawns vary mildly
The Last of Us
Encounter layouts unknown first time only
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption
Mission approaches and economy are learnable
The Last of Us
Resource crafting and encounter routing
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.