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 slow horror-leaning Doom reboot built on darkness and scripted ambushes.

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.
Doom 3 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.
Doom 3
Closet ambushes punish slow target acquisition
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.
Doom 3
Demon spawns are scripted triggers, not adaptation
Red Dead Redemption
Multiplayer skirmishes add light human prediction
Doom 3 leans a little harder on variance, though the gap is small.
Doom 3
Darkness hides ambushes until memorised
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.
Doom 3
Ammo management and trigger knowledge trivialise replays
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.