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

Optimization · Pure Optimization
A landmark strategy game combining a turn-based campaign for control of Rome with massive real-time battles.

Optimization · Pure Optimization
A stealth sim about casing houses and planning optimal heists.
Rome: Total War leans Optimization (Pure Optimization); Thief Simulator 2 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.
Rome: Total War
Real-time battle micro rewards quick unit handling
Thief Simulator 2
Lockpicking and stealth timing matter but stay light
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Rome: Total War
Optional multiplayer battles; campaign AI is mappable
Thief Simulator 2
NPC patrols follow scripted routes, not adaptive
Thief Simulator 2 leans a little harder on variance, though the gap is small.
Rome: Total War
Diplomacy and AI moves add modest fog
Thief Simulator 2
Loot contents and patrol timing add mild uncertainty
Rome: Total War leans a little harder on optimization, though the gap is small.
Rome: Total War
Campaign economy, recruitment, and battle tactics are solvable
Thief Simulator 2
Planning routes, tools and casing targets is the core
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.