head to head
Neither is simply harder - they are hard in different places. Mutant Year Zero: Road to Eden demands more execution; Phasmophobia demands more variance.

Optimization · Pure Optimization
Using stealth-phase positioning to construct optimal ambushes against scripted patrols.

Variance · Systems & Chaos
A cooperative horror investigation about identifying a randomised ghost from evidence.
Mutant Year Zero: Road to Eden leans Optimization (Pure Optimization); Phasmophobia leans Variance (Systems & Chaos).
Mutant Year Zero: Road to Eden leans clearly harder on execution.
Mutant Year Zero: Road to Eden
Stealth positioning before combat demands spatial precision
Phasmophobia
Minimal aiming; you just walk and use tools.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mutant Year Zero: Road to Eden
Enemies patrol fixed routes; no adaptive opponent modeling
Phasmophobia
Ghost behaviour is randomised, not adaptive to you.
Phasmophobia leans clearly harder on variance.
Mutant Year Zero: Road to Eden
Hit chances and mutation procs introduce meaningful RNG
Phasmophobia
Ghost type and evidence rolls are hidden each contract.
Mutant Year Zero: Road to Eden leans clearly harder on optimization.
Mutant Year Zero: Road to Eden
Stalker trait loadouts and pre-combat positioning are tight optimization puzzles
Phasmophobia
Evidence trees and equipment loadouts are solvable checklists.
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.