head to head
Aion asks more than Grand Theft Auto: San Andreas, and the gap is reads.

Execution · Practiced Mastery
A PvP-centric MMO where aerial execution and reading opponents in Abyss battles define competitive performance.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Aion leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Aion leans clearly harder on execution.
Aion
Aerial combat and combo chaining require timing and positioning
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Aion leans clearly harder on reads.
Aion
Rifting and Abyss PvP feature real adaptive opponents
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Aion leans a little harder on variance, though the gap is small.
Aion
Enchantment stone RNG is a meaningful hidden-information layer
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Aion
Manastones and gear sets have well-known optimal configurations
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
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.