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

Optimization · Light / Casual
A walking simulator piecing together a vanished English village's final days.

Optimization · Light / Casual
A first-person mystery set in a snowed-in hotel, driven entirely by exploration and phone calls.
Everybody's Gone to the Rapture leans Optimization (Light / Casual); The Suicide of Rachel Foster leans Optimization (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Everybody's Gone to the Rapture
Walking is the only verb
The Suicide of Rachel Foster
Walking a hotel; no dexterity test.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Everybody's Gone to the Rapture
No opponent
The Suicide of Rachel Foster
No opponent; a phone companion guides you.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Everybody's Gone to the Rapture
Story fragments hidden until found
The Suicide of Rachel Foster
Fixed mystery; nothing randomised.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Everybody's Gone to the Rapture
Light exploration completion at most
The Suicide of Rachel Foster
Light navigation and clue-following through the hotel.
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.