head to head
Need for Speed Unbound 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.

Execution · Practiced Mastery
Street racer with stylized arcade handling.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Need for Speed Unbound leans Execution (Practiced Mastery).
Need for Speed Unbound leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Need for Speed Unbound
Arcade drift and grip handling
Need for Speed Unbound leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Need for Speed Unbound
Online lobbies, AI cops
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
Need for Speed Unbound
Heat level and cop chase RNG
Grand Theft Auto: San Andreas 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
Need for Speed Unbound
Car build, betting strategy, garage growth
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.