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

Optimization · Pure Optimization
A narrative horror journey testing patience and light puzzle-solving more than skill.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Lorelai leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Lorelai
Point-and-click traversal with no twitch demands
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Lorelai
No adaptive opponent in this scripted story
Portal 2
No opponent; puzzles are static.
Lorelai leans clearly harder on variance.
Lorelai
Story beats are unknown until experienced, then fixed
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Lorelai
Light adventure-game puzzles with discoverable solutions
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.