head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Pure Mechanics
First-person physics platformer about leaping across a convoy of crashing trucks.

Execution · Pure Mechanics
An endless runner testing reflexes dodging obstacles at accelerating speed.
Clustertruck leans Execution (Pure Mechanics); Subway Surfers City 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.
Clustertruck
Frame-tight jumps across moving trucks
Subway Surfers City
Swiping to dodge obstacles at speed is the whole game
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Clustertruck
No opponent
Subway Surfers City
No opponent; an endless solo runner
Subway Surfers City leans a little harder on variance, though the gap is small.
Clustertruck
Physics chaos makes truck piles unpredictable
Subway Surfers City
Obstacle patterns are procedurally generated each run
Clustertruck leans a little harder on optimization, though the gap is small.
Clustertruck
Route lines and ability use for speedruns
Subway Surfers City
Upgrade choices and pickup routing improve high scores
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.