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
A free-form fantasy RPG where skill-leveling and spell-craft builds dominate.

Optimization · Pure Optimization
A stealth sim about casing houses and planning optimal heists.
The Elder Scrolls IV: Oblivion 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.
The Elder Scrolls IV: Oblivion
Real-time swing and block, modest demand
Thief Simulator 2
Lockpicking and stealth timing matter but stay light
Thief Simulator 2 leans a little harder on reads, though the gap is small.
The Elder Scrolls IV: Oblivion
Scripted enemies
Thief Simulator 2
NPC patrols follow scripted routes, not adaptive
Thief Simulator 2 leans a little harder on variance, though the gap is small.
The Elder Scrolls IV: Oblivion
Loot and level-scaling rolls
Thief Simulator 2
Loot contents and patrol timing add mild uncertainty
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Elder Scrolls IV: Oblivion
Skill leveling, spell crafting, exploit-prone builds
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.