head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Shantae and the Pirate's Curse demands more execution.

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

Execution · Practiced Mastery
A 2D platformer where pirate gear unlocks new movement abilities across interconnected islands.
Grand Theft Auto V leans Execution (Practiced Mastery); Shantae and the Pirate's Curse leans Execution (Practiced Mastery).
Shantae and the Pirate's Curse leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Shantae and the Pirate's Curse
Precise platforming and boss dodges demand clean inputs
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Shantae and the Pirate's Curse
Enemies and bosses run fixed scripted patterns
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Shantae and the Pirate's Curse
Layouts and item locations are static once learned
Shantae and the Pirate's Curse leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Shantae and the Pirate's Curse
Item order and route knowledge matter, especially speedrunning
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.