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

Execution · Pure Mechanics
A dexterity gag - fighting intentionally terrible physics controls to do simple tasks.

Execution · Twitch Chaos
An endless runner testing swipe reflexes against procedurally generated obstacle streams.
Hand Simulator leans Execution (Pure Mechanics); Subway Surfers leans Execution (Twitch Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Hand Simulator
Wrestling deliberately awkward finger physics IS the game
Subway Surfers
Swipe reaction speed at increasing pace is everything
Hand Simulator leans a little harder on reads, though the gap is small.
Hand Simulator
Multiplayer chaos is physics comedy, not prediction
Subway Surfers
No opponent - just oncoming obstacles
Subway Surfers leans a little harder on variance, though the gap is small.
Hand Simulator
Physics jank makes outcomes wobbly by design
Subway Surfers
Procedural track segments keep each run unseen ahead
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Hand Simulator
Little system depth beyond learning the controls
Subway Surfers
Powerup upgrades matter little beyond reflex play
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.