head to head
Neither is simply harder - they are hard in different places. Portal demands more execution; Solasta: Crown of the Magister demands more variance.

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

Optimization · Pure Optimization
A faithful D&D 5E dungeon crawl where concentration management and class synergies define optimal parties.
Portal leans Optimization (Pure Optimization); Solasta: Crown of the Magister leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
Solasta: Crown of the Magister
D&D 5E turn-based rules fully automate dice; no twitch exists
Solasta: Crown of the Magister leans a little harder on reads, though the gap is small.
Portal
No adversary modeling player.
Solasta: Crown of the Magister
All dungeon enemies follow scripted AI behaviour and patrol routes
Solasta: Crown of the Magister leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Solasta: Crown of the Magister
Roll randomness and hidden enemy positions add unknowns to each encounter
Solasta: Crown of the Magister leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Solasta: Crown of the Magister
5E class synergies, concentration management and high-ground exploitation are 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.