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

Optimization · Pure Optimization
A slow god-game economy where layout efficiency is the only real lever.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Godus leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Godus
Clicking and sculpting land has no dexterity test
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Godus
Followers are simulated, never adaptive
Portal
No adversary modeling player.
Godus leans clearly harder on variance.
Godus
Card and resource pacing adds mild unpredictability
Portal
Deterministic chambers; no randomness.
Portal leans clearly harder on optimization.
Godus
Settlement layout and belief economy are the only levers
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.