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

Optimization · Practiced Mastery
Isometric co-op puzzling testing coordination and trap-room solutions.

Optimization · Practiced Mastery
A lovingly pixelled aerial adventure where Otus carries gunner friends through floating islands.
Lara Croft and the Temple of Osiris leans Optimization (Practiced Mastery); Owlboy leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Temple of Osiris
Twin-stick aiming and trap dodging take light skill
Owlboy
Flying and gunner-swapping in light combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Temple of Osiris
Enemies swarm on fixed triggers
Owlboy
Scripted pirates and bosses
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Temple of Osiris
Puzzle and trap layouts are fixed once seen
Owlboy
Hand-crafted, deterministic world
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Lara Croft and the Temple of Osiris
Co-op puzzle solving and score routing lead the test
Owlboy
Boss patterns and secrets are learnable
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.