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
Action RPG prequel to FFVII whose combat spins a slot machine for buffs.

Execution · Practiced Mastery
Claustrophobic post-apocalyptic shooter where bullets double as currency.
Crisis Core: Final Fantasy VII 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.
Crisis Core: Final Fantasy VII
real-time dodging and attack 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.
Crisis Core: Final Fantasy VII
no adaptive opponent
Metro 2033
mutants and bandits follow scripts
Crisis Core: Final Fantasy VII leans a little harder on variance, though the gap is small.
Crisis Core: Final Fantasy VII
DMW slot reels randomize limit breaks and levels
Metro 2033
hidden moral points and supplies first run
Crisis Core: Final Fantasy VII leans a little harder on optimization, though the gap is small.
Crisis Core: Final Fantasy VII
materia fusion is a deep solvable system
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.