head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Optimization · Systems & Chaos
Managing a survivor community's economy and risk under permadeath randomness.
Mutant Year Zero: Road to Eden leans Optimization (Pure Optimization); State of Decay 2 leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mutant Year Zero: Road to Eden
Stealth positioning before combat demands spatial precision
State of Decay 2
Combat is forgiving; stealth and swings need modest timing
Mutant Year Zero: Road to Eden leans a little harder on reads, though the gap is small.
Mutant Year Zero: Road to Eden
Enemies patrol fixed routes; no adaptive opponent modeling
State of Decay 2
Zombies and hostile NPCs follow randomised scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mutant Year Zero: Road to Eden
Hit chances and mutation procs introduce meaningful RNG
State of Decay 2
Permadeath, infestations and survivor traits randomise each community
Mutant Year Zero: Road to Eden leans a little harder on optimization, though the gap is small.
Mutant Year Zero: Road to Eden
Stalker trait loadouts and pre-combat positioning are tight optimization puzzles
State of Decay 2
Base building, resource routing and survivor management drive survival
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.