head to head
Neither is simply harder - they are hard in different places. Grand Ages: Medieval demands more reads; Portal demands more execution.

Optimization · Pure Optimization
Building a medieval trade empire by optimizing routes, cities and economy across Europe.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Grand Ages: Medieval leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Grand Ages: Medieval
No twitch input - menus and orders only
Portal
Portal placement timing modest.
Grand Ages: Medieval leans clearly harder on reads.
Grand Ages: Medieval
AI rivals follow fixed strategy, not adaptive modelling
Portal
No adversary modeling player.
Grand Ages: Medieval leans clearly harder on variance.
Grand Ages: Medieval
Map and events scripted-but-unknown until explored
Portal
Deterministic chambers; no randomness.
Grand Ages: Medieval leans a little harder on optimization, though the gap is small.
Grand Ages: Medieval
Trade routes, city placement and economy are the solvable core
Portal
Pure puzzle-solving optimization.
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.