head to head
Thief II: The Metal Age asks more than The Elder Scrolls V: Skyrim, and the gap is optimization.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.

Optimization · Pure Optimization
Mastering fixed guard circuits and tool inventories to ghost sprawling levels without a trace.
The Elder Scrolls V: Skyrim 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.
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
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.
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
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.
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Thief II: The Metal Age
Camera placements and patrol timing are hidden on first entry
Thief II: The Metal Age leans clearly harder on optimization.
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
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.