head to head
Metal Gear Solid: Peace Walker 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.

Optimization · Practiced Mastery
A portable Metal Gear pairing mission stealth with a base-building development metagame.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Metal Gear Solid: Peace Walker leans Optimization (Practiced Mastery).
Metal Gear Solid: Peace Walker leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Metal Gear Solid: Peace Walker
Boss vehicle fights and CQC chains test aim and timing.
Metal Gear Solid: Peace Walker leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Metal Gear Solid: Peace Walker
Enemy AI is scripted and predictable.
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
Metal Gear Solid: Peace Walker
Missions are fixed; soldier recruitment adds slight randomness.
Metal Gear Solid: Peace Walker leans clearly harder on optimization.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Metal Gear Solid: Peace Walker
Mother Base management and weapon development are pure systems.
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.