head to head
Metal Gear Solid: Peace Walker asks more than Grand Theft Auto V, and the gap is optimization.

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

Optimization · Practiced Mastery
A portable Metal Gear pairing mission stealth with a base-building development metagame.
Grand Theft Auto V leans Execution (Practiced Mastery); Metal Gear Solid: Peace Walker leans Optimization (Practiced Mastery).
Metal Gear Solid: Peace Walker leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Metal Gear Solid: Peace Walker
Boss vehicle fights and CQC chains test aim and timing.
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
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 V
Some mission and lobby 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 V
Heists, money loops, builds learnable.
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.