head to head
Helldivers 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
Twin-stick co-op shooter precursor.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Helldivers leans Optimization (Practiced Mastery).
Helldivers leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Helldivers
Twin-stick aim and stratagem inputs
Helldivers leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Helldivers
Scripted enemies, no real reads
Helldivers leans clearly harder on variance.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Helldivers
Random spawns and patrol pressure
Helldivers 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
Helldivers
Loadout combos and stratagem chains
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.