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

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

Optimization · Practiced Mastery
A tense survival horror where one bite kills your survivor for good.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); ZombiU leans Optimization (Practiced Mastery).
ZombiU leans a little harder on execution, though the gap is small.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
ZombiU
Deliberate cricket-bat timing and panic inventory management
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
ZombiU
Zombies shamble on fixed logic
ZombiU leans clearly harder on variance.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
ZombiU
Permadeath runs face unknown spawn placements
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
ZombiU
Route knowledge, supply caching, safehouse planning
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.