head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Practiced Mastery
Methodically mapping a hostile station where knowledge and routing beat reflexes.

Optimization · Pure Optimization
A 2D sandbox where preparation and gear tiering carry boss fights.
System Shock leans Optimization (Practiced Mastery); Terraria leans Optimization (Pure Optimization).
System Shock leans a little harder on execution, though the gap is small.
System Shock
Combat and cyberspace ask competent but dated reflexes
Terraria
Boss fights require dodging and aim under pressure.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
System Shock
SHODAN's threats are scripted, not an adapting mind
Terraria
Bosses use scripted attacks; no adaptation.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
System Shock
Citadel's layout and logs are hidden until uncovered
Terraria
World seeds and loot drops randomized.
Terraria leans a little harder on optimization, though the gap is small.
System Shock
Inventory, routing and station knowledge solve the game
Terraria
Gear progression and arena prep solve every boss.
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.