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 endless runner testing reflexes dodging obstacles at accelerating speed.

Execution · Pure Mechanics
Player-made platforming gauntlets where precision execution meets unseen level design.
Subway Surfers City leans Execution (Pure Mechanics); Super Mario Maker 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.
Subway Surfers City
Swiping to dodge obstacles at speed is the whole game
Super Mario Maker
Community kaizo levels push platforming precision to extremes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Subway Surfers City
No opponent; an endless solo runner
Super Mario Maker
Levels are static once built; nothing adapts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Subway Surfers City
Obstacle patterns are procedurally generated each run
Super Mario Maker
Unknown user levels are hidden information until attempted
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Subway Surfers City
Upgrade choices and pickup routing improve high scores
Super Mario Maker
Mastering tool tech and level conventions is learnable
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.