head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Optimization · Practiced Mastery
A team-based Marvel ARPG where squad building and skill point allocation beat raw reflexes.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); X-Men Legends II: Rise of Apocalypse 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: San Andreas
Flying school and drive-bys need decent hands
X-Men Legends II: Rise of Apocalypse
Brawling and power timing are light demands.
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
X-Men Legends II: Rise of Apocalypse
Scripted mutant enemies, no adaptation.
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
X-Men Legends II: Rise of Apocalypse
Minor loot randomness in equipment drops.
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
X-Men Legends II: Rise of Apocalypse
Team composition and skill allocation carry the campaign.
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.