head to head
Neither is simply harder - they are hard in different places. All Guns on Deck demands more variance; Portal 2 demands more optimization.

Optimization · Pure Optimization
A naval strategy-action hybrid testing fleet management and conquest planning.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
All Guns on Deck leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
All Guns on Deck
Light action combat with modest timing demands
Portal 2
Portal placement requires some precision but timing is lenient.
All Guns on Deck leans clearly harder on reads.
All Guns on Deck
Faction AI is scripted, no adaptive prediction
Portal 2
No opponent; puzzles are static.
All Guns on Deck leans clearly harder on variance.
All Guns on Deck
Battle outcomes have some rolled randomness
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
All Guns on Deck
Fleet management and strategic conquest is the core layer
Portal 2
Solving the puzzle's logic IS the entire 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.