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

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

Optimization · Practiced Mastery
An open-world action game about blowing up Nazi installations across a stylized black-and-white Paris.
Grand Theft Auto V leans Execution (Practiced Mastery); The Saboteur leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Driving and shooting demand decent inputs.
The Saboteur
Climbing, driving and shootouts need moderate dexterity
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
The Saboteur
Nazi alarm AI follows predictable suspicion rules
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Some mission and lobby randomness.
The Saboteur
Patrols vary slightly across the open city
The Saboteur leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
The Saboteur
Plotting demolition targets and escape routes is the game
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.