head to head
The Elder Scrolls V: Skyrim asks more than Planescape: Torment, and the gap is execution.

Optimization · Pure Optimization
A narrative RPG that tests knowledge of its philosophical systems and dialogue trees more than any combat skill.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Planescape: Torment leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Planescape: Torment
Combat is deemphasised; the game is built to be avoided or trivial
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Planescape: Torment leans a little harder on reads, though the gap is small.
Planescape: Torment
NPCs are scripted personalities; no adaptive opponent exists
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Planescape: Torment leans a little harder on variance, though the gap is small.
Planescape: Torment
Some dialogue outcomes and item discoveries are hidden until explored
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Planescape: Torment
Stat allocation, dialogue routing and companion management reward system mastery
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.