head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
A coin-obsessed 2D Mario built around hoarding a million coins.

Execution · Practiced Mastery
Storybook N64 platformer where baby Yoshis eat fruit to finish pages.
New Super Mario Bros. 2 leans Execution (Practiced Mastery); Yoshi's Story leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
New Super Mario Bros. 2
Standard 2D Mario jumping precision
Yoshi's Story
Gentle platforming with light egg-throw precision.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
New Super Mario Bros. 2
Fully scripted enemies
Yoshi's Story
Scripted enemies throughout.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
New Super Mario Bros. 2
Fixed levels, known secrets
Yoshi's Story
Fruit placement is fixed per level.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
New Super Mario Bros. 2
Coin-rush routing for maximum collection
Yoshi's Story
Melon routes for high scores are quickly mapped.
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.