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
An isometric action RPG narrated as you play.

Execution · Practiced Mastery
Claustrophobic post-apocalyptic shooter where bullets double as currency.
Bastion 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.
Bastion
Action combat needs timing and aim.
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.
Bastion
Enemies are scripted.
Metro 2033
mutants and bandits follow scripts
Metro 2033 leans a little harder on variance, though the gap is small.
Bastion
Minor loot variance.
Metro 2033
hidden moral points and supplies first run
Bastion leans a little harder on optimization, though the gap is small.
Bastion
Weapon and idol builds reward planning.
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.