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
An endless runner testing swipe reflexes against procedurally generated obstacle streams.

Execution · Pure Mechanics
The defining mobile endless runner of swiping past cliffs, roots, and flames at increasing speed.
Subway Surfers leans Execution (Twitch Chaos); Temple Run leans Execution (Pure Mechanics).
Temple Run leans a little harder on execution, though the gap is small.
Subway Surfers
Swipe reaction speed at increasing pace is everything
Temple Run
Swipe reactions at ever-rising speed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Subway Surfers
No opponent - just oncoming obstacles
Temple Run
The demon monkeys never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Subway Surfers
Procedural track segments keep each run unseen ahead
Temple Run
Procedural track segments each run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Subway Surfers
Powerup upgrades matter little beyond reflex play
Temple Run
Powerup upgrades and segment recognition help
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.