head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, 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
Co-op physics party game about chaining grabbed hands across deadly gaps.
Fruit Ninja leans Execution (Pure Mechanics); Heave Ho 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.
Fruit Ninja
Swipe accuracy and combo timing
Heave Ho
Grip timing and swing physics under chaos
Heave Ho leans a little harder on reads, though the gap is small.
Fruit Ninja
No opponent
Heave Ho
Friends sabotage, but it is party chaos
Fruit Ninja leans a little harder on variance, though the gap is small.
Fruit Ninja
Random fruit and bomb spawns
Heave Ho
Physics wobble creates slapstick
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
Heave Ho
Levels are short and shallow to route
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.