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 combat metroidvania testing precise platforming execution against fixed enemy patterns.

Execution · Pure Mechanics
Split-attention aiming and flying through fixed, memorizable rail-shooter stages.
Guacamelee! Super Turbo Championship Edition leans Execution (Pure Mechanics); Star Fox Zero 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.
Guacamelee! Super Turbo Championship Edition
Combo brawling and dimension-swap platforming demand tight inputs
Star Fox Zero
Dual-screen aiming while flying is the central demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Guacamelee! Super Turbo Championship Edition
Enemies and bosses are colour-coded fixed patterns
Star Fox Zero
Enemy squadrons fly scripted routes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Guacamelee! Super Turbo Championship Edition
Hand-built world with nothing random
Star Fox Zero
Levels replay identically every run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Guacamelee! Super Turbo Championship Edition
Ability-gated routing and upgrade order reward planning
Star Fox Zero
Score routes and medal paths reward 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.