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

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

Optimization · Pure Optimization
Decoding obtuse fixed puzzle chains hidden behind surreal imagery.
Portal leans Optimization (Pure Optimization); Rusty Lake Paradise leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
Rusty Lake Paradise
Clicking scenes requires no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
No adversary modeling player.
Rusty Lake Paradise
A scripted surreal story; nothing adapts
Rusty Lake Paradise leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Rusty Lake Paradise
Obtuse solutions are hidden information on first play
Portal leans clearly harder on optimization.
Portal
Pure puzzle-solving optimization.
Rusty Lake Paradise
Each plague ritual is a fixed puzzle chain to decode
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.