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
Landmark first-person puzzle adventure solved by careful observation and note-taking.

Optimization · Pure Optimization
Evidence-gathering and deduction-board logic with no physical or adversarial layer.
Myst leans Optimization (Pure Optimization); The Testament of Sherlock Holmes 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.
Myst
Clicking through static scenes
The Testament of Sherlock Holmes
Pointing and clicking through crime scenes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Myst
No adversary at all
The Testament of Sherlock Holmes
Suspects are written, not adapting
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Myst
Clues hidden until found, then fixed forever
The Testament of Sherlock Holmes
Clues are hidden information until uncovered
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Myst
Observation-driven logic puzzles with deterministic solutions
The Testament of Sherlock Holmes
The deduction board is a solvable logic puzzle
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.