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 handheld Ratchet & Clank adventure shrunk down for PSP with armour collecting.

Execution · Practiced Mastery
Storybook N64 platformer where baby Yoshis eat fruit to finish pages.
Ratchet & Clank: Size Matters 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.
Ratchet & Clank: Size Matters
Run-and-gun platforming on PSP controls
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.
Ratchet & Clank: Size Matters
Enemies are scripted
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.
Ratchet & Clank: Size Matters
Fixed levels and drops
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.
Ratchet & Clank: Size Matters
Weapon upgrades and armour-set collecting
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.