head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Out of This World demands more optimization.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Optimization · Practiced Mastery
Trial-and-error memorisation of fixed death sequences, then executing the learned solution precisely.
Grand Theft Auto V leans Execution (Practiced Mastery); Out of This World leans Optimization (Practiced Mastery).
Out of This World leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Out of This World
Precise jump and laser timing within tight scripted windows
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Out of This World
Every threat is a fixed script, never adapting
Out of This World leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Out of This World
Deaths come from unknown scripted traps until memorised
Out of This World leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Out of This World
The game is solved by mapping each screen's exact sequence
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.