head to head
Diablo III asks more than The Elder Scrolls V: Skyrim, and the gap is variance.

Optimization · Pure Optimization
A pure loot-and-build treadmill where set-bonus optimisation and Rift pushing define performance.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Diablo III leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
Diablo III leans a little harder on execution, though the gap is small.
Diablo III
Greater Rift pushing has minor mechanical demand in builds
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Diablo III leans a little harder on reads, though the gap is small.
Diablo III
No meaningful adaptive opponent; co-op is cooperative
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Diablo III leans clearly harder on variance.
Diablo III
Primal Ancient drops and set dungeon RNG drive the grind
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Diablo III leans clearly harder on optimization.
Diablo III
Set bonuses and paragon levelling are almost entirely solvable
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
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.