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

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
Managing a survivor community's economy and defenses after the collapse.
Portal 2 leans Optimization (Pure Optimization); Survivalist 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.
Portal 2
Portal placement requires some precision but timing is lenient.
Survivalist
Top-down combat needs only modest aim and kiting
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
Survivalist
NPC factions follow systemic scripts, not adaptation
Survivalist leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Survivalist
Scavenging finds and event triggers are hidden until explored
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Survivalist
Community building, farming and trade economy are the solvable core
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.