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
Claymation point-and-click adventure sculpted entirely from plasticine whimsy.

Optimization · Pure Optimization
A heartfelt WWI puzzle adventure following four lives through the trenches.
The Neverhood leans Optimization (Pure Optimization); Valiant Hearts: The Great War 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.
The Neverhood
Point-and-click; no dexterity
Valiant Hearts: The Great War
Gentle timing in a few chase sequences
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Neverhood
No opposition exists
Valiant Hearts: The Great War
No opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The Neverhood
Puzzles hidden until discovered, then fixed
Valiant Hearts: The Great War
Fixed puzzles, fully visible
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Neverhood
Adventure puzzle chains with single solutions
Valiant Hearts: The Great War
Simple inventory and environmental puzzles with set solutions
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.