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
A retro-styled turn-based RPG about two solstice warriors.
Red Dead Redemption leans Execution (Practiced Mastery); Sea of Stars 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
Sea of Stars
Timed hits demand input precision.
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
Sea of Stars
Enemies are 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
Sea of Stars
Light combat randomness.
Sea of Stars leans a little harder on optimization, though the gap is small.
Red Dead Redemption
Mission approaches and economy are learnable
Sea of Stars
Combo and resource planning reward optimization.
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.