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
A first-person runner testing reflexive timing at extreme speed.

Execution · Pure Mechanics
A relentless wave-clearing shooter that tests sustained aim and movement against massive scripted enemy crowds.
Fotonica leans Execution (Pure Mechanics); Painkiller (2004) leans Execution (Pure Mechanics).
Fotonica leans a little harder on execution, though the gap is small.
Fotonica
One-button timing at extreme speed defines everything
Painkiller (2004)
Constant crowd-control movement against overwhelming enemy counts demands fast aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fotonica
Solo runner, no opponent to predict
Painkiller (2004)
All enemies are scripted waves with fixed attack patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fotonica
Tracks are fixed once learned, little randomness
Painkiller (2004)
Enemy counts and placements are fixed with minimal unknown elements
Painkiller (2004) leans a little harder on optimization, though the gap is small.
Fotonica
Memorizing track geometry plans optimal lines
Painkiller (2004)
Tarot card selection and level routing provide a thin solvable layer
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.