head to head
Icewind Dale II asks more than The Elder Scrolls V: Skyrim, and the gap is variance.

Optimization · Pure Optimization
A 3rd Edition ruleset combat puzzle where multi-classing and feat selection unlock dominant strategies.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Icewind Dale II leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans a little harder on execution, though the gap is small.
Icewind Dale II
Real-time-with-pause negates twitch requirements
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Icewind Dale II leans a little harder on reads, though the gap is small.
Icewind Dale II
Scripted enemy routines offer nothing to read or predict adaptively
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Icewind Dale II leans clearly harder on variance.
Icewind Dale II
3E feat combinations and hidden enemy resistances create unknown-information layers
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Icewind Dale II leans clearly harder on optimization.
Icewind Dale II
3rd Edition feat optimization and multi-class architecture dominate success
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.