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
Open-zone Metro entry trading tunnels for a cross-Russia survival journey.

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.
Metro Exodus 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 Exodus
open-zone gunplay and stealth takedowns
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 Exodus
human and mutant AI is mappable
Red Dead Redemption
Multiplayer skirmishes add light human prediction
Metro Exodus leans a little harder on variance, though the gap is small.
Metro Exodus
weather and patrols add mild uncertainty
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 Exodus
crafting, scavenging, and approach planning
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.