head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Practiced Mastery
A loose sandbox of shooting and demolition with modest aiming demands and light economy play.

Execution · Practiced Mastery
Cinematic survival action where scavenged resources and stealth carry you through the apocalypse.
Mercenaries 2: World in Flames 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.
Mercenaries 2: World in Flames
Third-person shooting and vehicle handling carry the moment-to-moment combat
The Last of Us
Aim, stealth timing, and scarce-ammo combat
The Last of Us leans a little harder on reads, though the gap is small.
Mercenaries 2: World in Flames
Scripted AI factions never model the player
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.
Mercenaries 2: World in Flames
Open-world chaos adds noise but little hidden information
The Last of Us
Encounter layouts unknown first time only
The Last of Us leans a little harder on optimization, though the gap is small.
Mercenaries 2: World in Flames
Faction money, contracts and gear unlocks reward light planning
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.