head to head
Neither is simply harder - they are hard in different places. Danganronpa: Trigger Happy Havoc demands more variance; Portal demands more execution.

Optimization · Pure Optimization
A school murder mystery where class trials test players' ability to assemble evidence into the correct counter-argument.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Danganronpa: Trigger Happy Havoc leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Danganronpa: Trigger Happy Havoc
Class trial rhythm sections add minor timing layer
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.
Danganronpa: Trigger Happy Havoc
Blackened is scripted per chapter; no adaptive deduction opponent
Portal
No adversary modeling player.
Danganronpa: Trigger Happy Havoc leans clearly harder on variance.
Danganronpa: Trigger Happy Havoc
Hidden killer identities and evidence drive trial uncertainty
Portal
Deterministic chambers; no randomness.
Portal leans clearly harder on optimization.
Danganronpa: Trigger Happy Havoc
Gathering evidence and building the correct argument chain is a solvable deduction loop
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.