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 NES run-and-gun testing reflex dodging through memorised enemy gauntlets.

Execution · Pure Mechanics
A skateboarding sandbox where tricks come from analog stick flicks rather than button combos.
Contra Force leans Execution (Pure Mechanics); Skate 2 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.
Contra Force
Run-and-gun dodging through bullet-heavy NES stages
Skate 2
Flick-it stick controls map tricks to genuine manual dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Contra Force
Terrorist enemies spawn on fixed scripts
Skate 2
Solo sandbox, no adaptive opposition
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Contra Force
Stage layouts never change
Skate 2
Static city, deterministic physics
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Contra Force
Character selection and power-up routing help modestly
Skate 2
Spot selection and line planning improve scores
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.