head to head
The Operative: No One Lives Forever asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Execution · Practiced Mastery
Sixties spy-comedy FPS mixing stealth, gadgets, and shootouts as agent Cate Archer.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); The Operative: No One Lives Forever leans Execution (Practiced Mastery).
The Operative: No One Lives Forever leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
The Operative: No One Lives Forever
Period gunplay and stealth timing carry missions
The Operative: No One Lives Forever leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
The Operative: No One Lives Forever
Guards run scripted patrol AI
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
The Operative: No One Lives Forever
First-run surprises in level scripting
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
The Operative: No One Lives Forever
Gadget use, stealth routes, and intelligence hunting
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.