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

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.

Execution · Practiced Mastery
The sequel-remake pairing Butcher Bay with a new stealth-action campaign aboard a mercenary ship.
Red Dead Redemption leans Execution (Practiced Mastery); The Chronicles of Riddick: Assault on Dark Athena leans Execution (Practiced Mastery).
The Chronicles of Riddick: Assault on Dark Athena leans a little harder on execution, though the gap is small.
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
The Chronicles of Riddick: Assault on Dark Athena
Melee takedowns and gunplay demand reliable hands
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 Chronicles of Riddick: Assault on Dark Athena
Drone and guard behavior is fully scripted
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 Chronicles of Riddick: Assault on Dark Athena
First-run uncertainty about patrols and drone placements
The Chronicles of Riddick: Assault on Dark Athena leans a little harder on optimization, though the gap is small.
Red Dead Redemption
Mission approaches and economy are learnable
The Chronicles of Riddick: Assault on Dark Athena
Stealth routes and encounter solutions are learnable fixed content
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.
full breakdown
Red Dead Redemption →
full breakdown
The Chronicles of Riddick: Assault on Dark Athena →