head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more optimization; Qvadriga demands more variance.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
A chariot racing team management simulation.
Portal 2 leans Optimization (Pure Optimization); Qvadriga leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Portal 2
Portal placement requires some precision but timing is lenient.
Qvadriga
minimal direct racing control, mostly management
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
Qvadriga
AI charioteers scripted, not adaptive
Qvadriga leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Qvadriga
race outcomes have randomized elements
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Qvadriga
team and chariot management strategy
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.