head to head
Kingdom Hearts Birth by Sleep 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 PSP prequel following three keyblade wielders with a deep command-melding build system.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Kingdom Hearts Birth by Sleep leans Optimization (Practiced Mastery).
Kingdom Hearts Birth by Sleep leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Kingdom Hearts Birth by Sleep
Dodge timing against brutal secret bosses
Kingdom Hearts Birth by Sleep leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Kingdom Hearts Birth by Sleep
Pattern-based bosses, no adaptation
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
Kingdom Hearts Birth by Sleep
Command melding outcomes are documented
Kingdom Hearts Birth by Sleep leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Kingdom Hearts Birth by Sleep
Command deck melding largely solves the game
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.