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
First-person physics platformer about leaping across a convoy of crashing trucks.

Execution · Pure Mechanics
A first-person runner testing reflexive timing at extreme speed.
Clustertruck leans Execution (Pure Mechanics); Fotonica leans Execution (Pure Mechanics).
Fotonica leans a little harder on execution, though the gap is small.
Clustertruck
Frame-tight jumps across moving trucks
Fotonica
One-button timing at extreme speed defines everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Clustertruck
No opponent
Fotonica
Solo runner, no opponent to predict
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Clustertruck
Physics chaos makes truck piles unpredictable
Fotonica
Tracks are fixed once learned, little randomness
Clustertruck leans a little harder on optimization, though the gap is small.
Clustertruck
Route lines and ability use for speedruns
Fotonica
Memorizing track geometry plans optimal lines
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.