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

Optimization · Light / Casual
A branching visual novel that tests little beyond exploring choice routes.

Optimization · Light / Casual
An interactive novel that tests narrative attention more than any game skill.
Everlasting Summer leans Optimization (Light / Casual); Ken Follett's The Pillars of the Earth leans Optimization (Light / Casual).
Ken Follett's The Pillars of the Earth leans a little harder on execution, though the gap is small.
Everlasting Summer
Reading and clicking choices, nothing physical
Ken Follett's The Pillars of the Earth
Point-and-click input has no physical ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Everlasting Summer
No opponent - characters follow fixed branching scripts
Ken Follett's The Pillars of the Earth
Branching story characters follow scripts, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Everlasting Summer
Route outcomes are hidden only until first playthroughs
Ken Follett's The Pillars of the Earth
Choice outcomes are unknown on a first playthrough
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Everlasting Summer
Mapping choice branches to endings is trivially solvable
Ken Follett's The Pillars of the Earth
Puzzles are sparse and single-solution
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.