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

Execution · Practiced Mastery
Open-zone Metro entry trading tunnels for a cross-Russia survival journey.

Optimization · Practiced Mastery
A tense survival horror where one bite kills your survivor for good.
Metro Exodus leans Execution (Practiced Mastery); ZombiU leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Metro Exodus
open-zone gunplay and stealth takedowns
ZombiU
Deliberate cricket-bat timing and panic inventory management
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metro Exodus
human and mutant AI is mappable
ZombiU
Zombies shamble on fixed logic
ZombiU leans a little harder on variance, though the gap is small.
Metro Exodus
weather and patrols add mild uncertainty
ZombiU
Permadeath runs face unknown spawn placements
ZombiU leans a little harder on optimization, though the gap is small.
Metro Exodus
crafting, scavenging, and approach planning
ZombiU
Route knowledge, supply caching, safehouse planning
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.