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 · Pure Optimization
An open-world Caribbean sandbox of ship duels, sword fights, trading, and treasure hunting.

Optimization · Pure Optimization
A 2D sandbox of procedurally generated planets driven by crafting progression.
Sid Meier's Pirates! leans Optimization (Pure Optimization); Starbound leans Optimization (Pure Optimization).
Sid Meier's Pirates! leans a little harder on execution, though the gap is small.
Sid Meier's Pirates!
Sword duel timing and ship-handling minigames
Starbound
Light platforming and combat, generous margins
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sid Meier's Pirates!
AI captains follow simple fixed behaviours
Starbound
Procedural NPCs follow simple fixed behaviours
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sid Meier's Pirates!
Treasure locations, wind, and town states roll randomly
Starbound
Procedural planets and loot keep early exploration unknown
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Sid Meier's Pirates!
Trade routes, faction standing, and career planning dominate
Starbound
Gear tiers, farming, and progression routes dominate
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.