head to head
Neither is simply harder - they are hard in different places. Portal demands more execution; The Battle of Polytopia demands more reads.

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

Optimization · Pure Optimization
A minimalist mobile-born 4X that compresses empire building into quick competitive matches.
Portal leans Optimization (Pure Optimization); The Battle of Polytopia leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
The Battle of Polytopia
Tap-based turns; no dexterity
The Battle of Polytopia leans clearly harder on reads.
Portal
No adversary modeling player.
The Battle of Polytopia
Ranked multiplayer rewards predicting human expansion and timing
The Battle of Polytopia leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
The Battle of Polytopia
Unexplored small maps hide ruins and rivals
The Battle of Polytopia leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
The Battle of Polytopia
Tight economy math makes perfect openings near-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.