head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
A swipe-em-up arcade game where slicing accuracy against random fruit spawns is the whole skill.

Execution · Pure Mechanics
A light reflex test of steering past obstacles until the yeti wins.
Fruit Ninja leans Execution (Pure Mechanics); SkiFree leans Execution (Pure Mechanics).
Fruit Ninja leans a little harder on execution, though the gap is small.
Fruit Ninja
Swipe accuracy and combo timing
SkiFree
Dodging trees and outrunning the yeti is pure reaction steering
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fruit Ninja
No opponent
SkiFree
The snowman is scripted pursuit, not an adapting mind
Fruit Ninja leans a little harder on variance, though the gap is small.
Fruit Ninja
Random fruit and bomb spawns
SkiFree
Obstacle placement varies run to run but stays shallow
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fruit Ninja
Combo and crit systems are shallow but real
SkiFree
Beyond slalom lines there is little system to solve
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.