head to head
Neither is simply harder - they are hard in different places. Portal demands more execution; The Settlers 7: Paths to a Kingdom demands more reads.

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

Optimization · Pure Optimization
Tuning interlocking production chains and racing victory-point routes.
Portal leans Optimization (Pure Optimization); The Settlers 7: Paths to a Kingdom leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
The Settlers 7: Paths to a Kingdom
Slow-paced clicking - no twitch demand
The Settlers 7: Paths to a Kingdom leans clearly harder on reads.
Portal
No adversary modeling player.
The Settlers 7: Paths to a Kingdom
Multiplayer victory-point races involve anticipating rival paths
The Settlers 7: Paths to a Kingdom leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
The Settlers 7: Paths to a Kingdom
Map resources are fixed and visible after scouting
The Settlers 7: Paths to a Kingdom leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
The Settlers 7: Paths to a Kingdom
Production chains and victory-point routing are the whole game
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.