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
Grand strategy wargame mixing turn-based empire play with real-time battles.

Optimization · Pure Optimization
Mastering fixed guard circuits and tool inventories to ghost sprawling levels without a trace.
Medieval II: Total War leans Optimization (Pure Optimization); Thief II: The Metal Age leans Optimization (Pure Optimization).
Thief II: The Metal Age leans a little harder on execution, though the gap is small.
Medieval II: Total War
real-time battle micro is modest
Thief II: The Metal Age
Fine arrow placement and rope climbing require care, not twitch
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Medieval II: Total War
campaign AI is exploitable and mappable
Thief II: The Metal Age
Mechanist guards run scripted beats, never adapting to tactics
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Medieval II: Total War
fog of war and event triggers hide some state
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.
Medieval II: Total War
economy, unit counters, and campaign map strategy dominate
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.