head to head
8 Ball Pool asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Execution · Practiced Mastery
Precise shot aiming plus planning the run-out several balls ahead.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
8 Ball Pool leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
8 Ball Pool leans clearly harder on execution.
8 Ball Pool
A perfect aim-line cheat wins nearly every rack outright
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
8 Ball Pool leans clearly harder on reads.
8 Ball Pool
Opponents alternate turns; little adaptive interaction to predict
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
8 Ball Pool
Break spreads add some randomness to each rack
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.
8 Ball Pool
Position play and run-out planning separate good players
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.