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
Rapture's plasmid-and-pistol shooter where ideology meets gunplay.

Optimization · Practiced Mastery
A real-time RPG carried by ascension-grid routing and magic crafting.
BioShock leans Execution (Practiced Mastery); Final Fantasy XV leans Optimization (Practiced Mastery).
BioShock leans a little harder on execution, though the gap is small.
BioShock
Shooting and plasmid timing required.
Final Fantasy XV
Real-time combat, modest input demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
BioShock
Splicers scripted; behaviors fixed.
Final Fantasy XV
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
BioShock
Loot and splicer spawns randomized.
Final Fantasy XV
Loot and ascension variance
Final Fantasy XV leans a little harder on optimization, though the gap is small.
BioShock
Tonics, plasmids, weapon upgrades solvable.
Final Fantasy XV
Ascension grid, magic crafting, party planning
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.