head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
Investigation and deduction-tree logic with token action interludes.

Optimization · Pure Optimization
Classic open-world RPG where stats and broken crafting systems trump twitch skill.
Sherlock Holmes: The Devil's Daughter leans Optimization (Pure Optimization); The Elder Scrolls III: Morrowind 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.
Sherlock Holmes: The Devil's Daughter
Occasional action minigames, mostly trivial
The Elder Scrolls III: Morrowind
Dice-roll combat ignores aim skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sherlock Holmes: The Devil's Daughter
Suspects are written characters, not adapting minds
The Elder Scrolls III: Morrowind
No adaptive opposition
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sherlock Holmes: The Devil's Daughter
Case clues are hidden until investigated
The Elder Scrolls III: Morrowind
Hit chances rolled behind the screen
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Sherlock Holmes: The Devil's Daughter
Deduction-tree reasoning from gathered evidence is the game
The Elder Scrolls III: Morrowind
Alchemy and spellcrafting are famously 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.
full breakdown
Sherlock Holmes: The Devil's Daughter →
full breakdown
The Elder Scrolls III: Morrowind →