head to head
Splatter: Zombiecalypse Now 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
A top-down shooter testing twin-stick aim and crowd management against zombie waves.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Splatter: Zombiecalypse Now leans Execution (Practiced Mastery).
Splatter: Zombiecalypse Now leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Splatter: Zombiecalypse Now
Twin-stick aiming and dodging carry every firefight
Splatter: Zombiecalypse Now leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Splatter: Zombiecalypse Now
Zombies swarm on scripted AI, not adaptive prediction
Splatter: Zombiecalypse Now leans clearly harder on variance.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Splatter: Zombiecalypse Now
Enemy spawns and item drops add run-to-run chaos
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
Splatter: Zombiecalypse Now
Weapon upgrades and positioning reward 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.