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

Optimization · Practiced Mastery
Open-world survival action about outrunning massive zombie hordes on a motorcycle.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Days Gone leans Optimization (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Days Gone
horde shooting and bike handling under pressure
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Days Gone
freaker AI is scripted swarm logic
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Days Gone
patrols and weather shift encounters slightly
Grand Theft Auto V
Some mission and lobby randomness.
Days Gone leans clearly harder on optimization.
Days Gone
horde routing, traps, and gear prep decide fights
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.