head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Noita demands more variance.

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

Optimization · Practiced Mastery
Pixel-physics roguelite where every pixel is simulated and lethal.
Grand Theft Auto V leans Execution (Practiced Mastery); Noita leans Optimization (Practiced Mastery).
Noita leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Noita
Real-time platforming and aim under physical chaos.
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Noita
Scripted enemy AI.
Noita leans clearly harder on variance.
Grand Theft Auto V
Some mission and lobby randomness.
Noita
Procedural world and wand drops dominate runs.
Noita leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Noita
Wand crafting and pixel physics reward deep mastery.
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.