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

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

Optimization · Practiced Mastery
Open-world Wizarding World RPG about exploring Hogwarts and chaining spell combos.
Grand Theft Auto V leans Execution (Practiced Mastery); Hogwarts Legacy leans Optimization (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Hogwarts Legacy
Spell combos and dodges at forgiving difficulty
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Hogwarts Legacy
Enemies use fixed shield-and-attack scripts
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Hogwarts Legacy
Little randomness beyond loot rolls
Hogwarts Legacy leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Hogwarts Legacy
Talents, gear traits, and combo routing dominate
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.