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.

Optimization · Practiced Mastery
Open-world kung-fu action RPG starring a customizable mutant rodent in a toxic wasteland.

Execution · Practiced Mastery
Claustrophobic post-apocalyptic shooter where bullets double as currency.
Biomutant leans Optimization (Practiced Mastery); Metro 2033 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Biomutant
Kung-fu combos and gunplay timing
Metro 2033
scarce-ammo gunfights punish sloppy aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Biomutant
Creatures follow scripted behaviors
Metro 2033
mutants and bandits follow scripts
Metro 2033 leans a little harder on variance, though the gap is small.
Biomutant
Random loot and mutation drops
Metro 2033
hidden moral points and supplies first run
Biomutant leans a little harder on optimization, though the gap is small.
Biomutant
Build crafting across mutations, gear, and classes
Metro 2033
ammo-as-currency economy and stealth routing
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.