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 · Twitch Chaos
The desert-set sequel to Alto's Adventure, adding balloons and wall rides to the endless ride.

Execution · Pure Mechanics
A swipe-em-up arcade game where slicing accuracy against random fruit spawns is the whole skill.
Alto's Odyssey leans Execution (Twitch Chaos); Fruit Ninja leans Execution (Pure Mechanics).
Fruit Ninja leans a little harder on execution, though the gap is small.
Alto's Odyssey
Trick chains and wall-ride timing
Fruit Ninja
Swipe accuracy and combo timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alto's Odyssey
No opponents
Fruit Ninja
No opponent
Alto's Odyssey leans a little harder on variance, though the gap is small.
Alto's Odyssey
Procedural desert biomes vary each run
Fruit Ninja
Random fruit and bomb spawns
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Alto's Odyssey
Light goal and combo systems
Fruit Ninja
Combo and crit systems are shallow but real
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.