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

Execution · Pure Mechanics
An on-rails shooter testing raw aim speed against memorised spawn scripts.

Execution · Pure Mechanics
A physics comedy about an octopus in a suit flailing through fatherhood without blowing his cover.
Heavy Fire: Afghanistan leans Execution (Pure Mechanics); Octodad: Dadliest Catch leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Heavy Fire: Afghanistan
Aimbot literally completes this on-rails shooter
Octodad: Dadliest Catch
Deliberately clumsy limb controls are the whole challenge
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Heavy Fire: Afghanistan
Enemies pop up on a fixed script
Octodad: Dadliest Catch
No opponents, just suspicion meters
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Heavy Fire: Afghanistan
Spawns are identical every run once seen
Octodad: Dadliest Catch
Physics wobble adds slapstick unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Heavy Fire: Afghanistan
Memorising spawn order is the only depth
Octodad: Dadliest Catch
Simple objectives, little system depth
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.