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
Claustrophobic post-apocalyptic shooter where bullets double as currency.

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.
Metro 2033 leans Execution (Practiced Mastery); Red Dead Redemption 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.
Metro 2033
scarce-ammo gunfights punish sloppy aim
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
Red Dead Redemption leans a little harder on reads, though the gap is small.
Metro 2033
mutants and bandits follow scripts
Red Dead Redemption
Multiplayer skirmishes add light human prediction
Metro 2033 leans a little harder on variance, though the gap is small.
Metro 2033
hidden moral points and supplies first run
Red Dead Redemption
Ambient events and spawns vary mildly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metro 2033
ammo-as-currency economy and stealth routing
Red Dead Redemption
Mission approaches and economy are learnable
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.