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
The defining mobile endless runner of swiping past cliffs, roots, and flames at increasing speed.

Execution · Twitch Chaos
One-touch reflex timing against procedurally generated obstacle streams.
Temple Run leans Execution (Pure Mechanics); Zombie Tsunami leans Execution (Twitch Chaos).
Temple Run leans a little harder on execution, though the gap is small.
Temple Run
Swipe reactions at ever-rising speed
Zombie Tsunami
One-touch jump timing for a growing horde is the whole test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Temple Run
The demon monkeys never adapt
Zombie Tsunami
No opponent - obstacles are procedural
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Temple Run
Procedural track segments each run
Zombie Tsunami
Procedural level generation decides what each run offers
Zombie Tsunami leans a little harder on optimization, though the gap is small.
Temple Run
Powerup upgrades and segment recognition help
Zombie Tsunami
Upgrade spending is a thin meta layer
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.