head to head
Neither is simply harder - they are hard in different places. God of War (2005) demands more optimization; Grand Theft Auto V demands more reads.

Execution · Practiced Mastery
Brutal Greek-myth spectacle brawler where Kratos chains blades through gods and QTE set pieces.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
God of War (2005) leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
God of War (2005) leans a little harder on execution, though the gap is small.
God of War (2005)
Blade combos, parries, and QTEs reward clean inputs
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
God of War (2005)
Mythic bosses run scripted phases
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Grand Theft Auto V leans a little harder on variance, though the gap is small.
God of War (2005)
Authored set pieces; nothing meaningful is hidden
Grand Theft Auto V
Some mission and lobby randomness.
God of War (2005) leans clearly harder on optimization.
God of War (2005)
Orb economy, magic priorities, and boss patterns are solvable
Grand Theft Auto V
Heists, money loops, builds learnable.
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.