head to head
Portal asks more than Obduction, and the gap is execution.

Optimization · Pure Optimization
A Myst-successor puzzle adventure about decoding alien machinery across spliced worlds.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Obduction leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Obduction
Walking and clicking only
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Obduction
No opponents at all
Portal
No adversary modeling player.
Obduction leans a little harder on variance, though the gap is small.
Obduction
Deterministic alien machinery
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Obduction
Number-system and swap-machine puzzles are fully solvable
Portal
Pure puzzle-solving optimization.
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.