head to head
Neither is simply harder - they are hard in different places. Portal demands more execution; Yes, Your Grace demands more variance.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
A kingdom-management narrative where you ration gold and favors as a beleaguered king.
Portal leans Optimization (Pure Optimization); Yes, Your Grace leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
Yes, Your Grace
Menu choices only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
No adversary modeling player.
Yes, Your Grace
Petitioners are scripted, not adaptive
Yes, Your Grace leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Yes, Your Grace
Outcomes of choices hidden on first run
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Yes, Your Grace
Resource budgeting across known story beats is solvable
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.