head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Practiced Mastery
A survival horror RPG blending real-time gunplay with tight ammo and build management.

Optimization · Pure Optimization
An open world where build optimisation dissolves every combat challenge.
Parasite Eve II leans Optimization (Practiced Mastery); The Elder Scrolls V: Skyrim - Special Edition 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.
Parasite Eve II
Real-time aiming, dodging, and tank-control positioning.
The Elder Scrolls V: Skyrim - Special Edition
Combat timing matters little; difficulty bends to your build
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Parasite Eve II
Creatures attack on fixed patterns.
The Elder Scrolls V: Skyrim - Special Edition
Draugr and dragons run scripted AI packages
Parasite Eve II leans a little harder on variance, though the gap is small.
Parasite Eve II
Unknown encounters and item placement first run.
The Elder Scrolls V: Skyrim - Special Edition
Loot rolls and radiant quests add minor mapped randomness
The Elder Scrolls V: Skyrim - Special Edition leans a little harder on optimization, though the gap is small.
Parasite Eve II
Ammo economy, parasite energy builds, and routing reward planning.
The Elder Scrolls V: Skyrim - Special Edition
Perk, crafting and stealth-archer loops trivially solve combat
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.