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.

Optimization · Practiced Mastery
A real-time RPG carried by ascension-grid routing and magic crafting.

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.
Final Fantasy XV leans Optimization (Practiced Mastery); Red Dead Redemption leans Execution (Practiced Mastery).
Red Dead Redemption leans a little harder on execution, though the gap is small.
Final Fantasy XV
Real-time combat, modest input demand
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XV
Scripted enemies
Red Dead Redemption
Multiplayer skirmishes add light human prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XV
Loot and ascension variance
Red Dead Redemption
Ambient events and spawns vary mildly
Final Fantasy XV leans a little harder on optimization, though the gap is small.
Final Fantasy XV
Ascension grid, magic crafting, party 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.