head to head
System Shock (1994) asks more than Deus Ex: Human Revolution, and the gap is variance.

Optimization · Pure Optimization
Choosing augmentation paths and routing through hubs to neutralise scripted opposition with minimal friction.

Optimization · Practiced Mastery
A complex immersive sim that rewards meticulous resource management and environmental puzzle solving over raw shooting skill.
Deus Ex: Human Revolution leans Optimization (Pure Optimization); System Shock (1994) leans Optimization (Practiced Mastery).
System Shock (1994) leans a little harder on execution, though the gap is small.
Deus Ex: Human Revolution
Combat demands moderate aim; takedowns are execution-gated
System Shock (1994)
Moderate aim demands with stamina and leaning mechanics as execution layer
Deus Ex: Human Revolution leans a little harder on reads, though the gap is small.
Deus Ex: Human Revolution
Guards use scripted alert states, not player-adaptive logic
System Shock (1994)
All enemies are scripted cyborgs and mutants with no adaptation
System Shock (1994) leans clearly harder on variance.
Deus Ex: Human Revolution
Enemy positions are static once patrol patterns are learned
System Shock (1994)
SHODAN camera placement and event triggers are opaque until mapped
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Deus Ex: Human Revolution
Augment loadout and approach routing solve each hub optimally
System Shock (1994)
Hacking, resource management, and log routing form deep solvable systems
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.