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
A reflex obstacle-course game about timing jumps and dodges through deadly stages.

Execution · Pure Mechanics
A run-and-gun arcade shooter that is almost pure twitch execution.
Aztec Challenge leans Execution (Pure Mechanics); Metal Slug 5 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.
Aztec Challenge
Reacting to spears, traps and pits with precise timing wins
Metal Slug 5
precise dodge/shoot run-and-gun demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Aztec Challenge
No adaptive opponent in a scripted obstacle gauntlet
Metal Slug 5
enemy waves are fully scripted patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Aztec Challenge
Some randomness in projectile timing
Metal Slug 5
minor drop and spawn randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Aztec Challenge
Pattern memorisation of each level underneath
Metal Slug 5
weapon pickup and route memorization
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.