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
Solving fixed item-combination puzzles inside a dark comic story.

Optimization · Pure Optimization
A dark psychological point-and-click adventure driven by fixed puzzles and a disturbing story.
Edna & Harvey: Harvey's New Eyes leans Optimization (Pure Optimization); Fran Bow 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.
Edna & Harvey: Harvey's New Eyes
Pointing and clicking has no dexterity ceiling
Fran Bow
Point-and-click inputs only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Edna & Harvey: Harvey's New Eyes
Characters are scripted comedy props
Fran Bow
No opponents
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Edna & Harvey: Harvey's New Eyes
Solutions are hidden until discovered once
Fran Bow
Hidden story layers until discovered
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Edna & Harvey: Harvey's New Eyes
Item-combination logic puzzles have single fixed answers
Fran Bow
Fixed puzzle solutions; fully 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.