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

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

Optimization · Pure Optimization
Scheduling training, decay and skill counters in a solvable management loop.
Portal leans Optimization (Pure Optimization); Punch Club leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
Punch Club
Fights resolve automatically; you never throw a punch
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.
Punch Club
Opponents are stat blocks with fixed styles, not minds
Punch Club leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Punch Club
Fight dice rolls and event pop-ups add noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
Pure puzzle-solving optimization.
Punch Club
Stat decay scheduling and skill-tree counters are 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.