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
A serene endless snowboarder about chaining backflips down procedurally generated slopes.

Execution · Pure Mechanics
The defining mobile endless runner of swiping past cliffs, roots, and flames at increasing speed.
Alto's Adventure leans Execution (Twitch Chaos); Temple Run leans Execution (Pure Mechanics).
Temple Run leans a little harder on execution, though the gap is small.
Alto's Adventure
One-touch trick timing and landings
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.
Alto's Adventure
No opponents
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.
Alto's Adventure
Procedural terrain keeps runs unpredictable
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.
Alto's Adventure
Goal checklist and combo logic shallow
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.