head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

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

Optimization · Practiced Mastery
A first-person Metroid adventure spanning planets, steered with the Wii's motion-aimed cannon.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Metroid Prime 3: Corruption leans Optimization (Practiced Mastery).
Metroid Prime 3: Corruption leans a little harder on execution, though the gap is small.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Metroid Prime 3: Corruption
Pointer aiming and Hypermode management in fights.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Metroid Prime 3: Corruption
Scripted bosses and pirates.
Grand Theft Auto: San Andreas leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Metroid Prime 3: Corruption
Deterministic worlds.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Metroid Prime 3: Corruption
Scanning, sequencing, and multi-planet routing drive progress.
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.