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

Optimization · Pure Optimization
Sandbox assassination at its purest: stage the perfect accident and walk away.

Optimization · Pure Optimization
Mastering fixed guard circuits and tool inventories to ghost sprawling levels without a trace.
Hitman: Blood Money leans Optimization (Pure Optimization); Thief II: The Metal Age leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Hitman: Blood Money
Modest aim and sneak demands once a plan exists
Thief II: The Metal Age
Fine arrow placement and rope climbing require care, not twitch
Thief II: The Metal Age leans a little harder on reads, though the gap is small.
Hitman: Blood Money
Crowds and guards run fixed routines
Thief II: The Metal Age
Mechanist guards run scripted beats, never adapting to tactics
Thief II: The Metal Age leans a little harder on variance, though the gap is small.
Hitman: Blood Money
Accident opportunities hidden until discovered
Thief II: The Metal Age
Camera placements and patrol timing are hidden on first entry
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Hitman: Blood Money
Accident-kill routing is a near-solvable planning puzzle
Thief II: The Metal Age
Loot routing and tool economy are fully optimisable once learned
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.