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.

Optimization · Practiced Mastery
Recruit-anyone London where operative variety carries every mission.
Red Dead Redemption leans Execution (Practiced Mastery); Watch Dogs: Legion leans Optimization (Practiced Mastery).
Red Dead Redemption leans a little harder on execution, though the gap is small.
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
Watch Dogs: Legion
Combat and driving forgiving across operatives.
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
Watch Dogs: Legion
AI scripted; no real modeling.
Watch Dogs: Legion leans a little harder on variance, though the gap is small.
Red Dead Redemption
Ambient events and spawns vary mildly
Watch Dogs: Legion
Recruit perks and patrols randomize widely.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption
Mission approaches and economy are learnable
Watch Dogs: Legion
Recruit synergy, gadgets, routes solvable.
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.