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
Zero-gravity physics game about wrestling floppy cosmonaut limbs through space-station chores.

Execution · Pure Mechanics
A vibrant 2D platformer with rhythm-based highlight levels.
Heavenly Bodies leans Execution (Pure Mechanics); Rayman Legends 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.
Heavenly Bodies
Deliberately awkward limb-by-limb zero-g control
Rayman Legends
Tight 2D platforming and music levels
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Heavenly Bodies
No opposition
Rayman Legends
No adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Heavenly Bodies
Fixed scenario layouts
Rayman Legends
Fixed levels
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Heavenly Bodies
Task order and clever anchor points
Rayman Legends
Time trial routing
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.