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

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

Optimization · Pure Optimization
A faction-routing RPG where custom spell combinations and allegiance optimization define the most efficient path.
Portal leans Optimization (Pure Optimization); Tyranny leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
Tyranny
Combat is secondary; faction routing and dialogue are the main skill axes
Tyranny leans a little harder on reads, though the gap is small.
Portal
No adversary modeling player.
Tyranny
Scripted NPC factions respond to choices but follow fixed logic trees
Tyranny leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Tyranny
Skill check thresholds and hidden lore flags create unknown-information branches
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
Pure puzzle-solving optimization.
Tyranny
Combo spell crafting and faction reputation routing reward system knowledge
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.