head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
Action-adventure about a photojournalist exposing an alien conspiracy with stealth and a camera.

Optimization · Practiced Mastery
Co-op superhero brawler about assembling the right four-hero squad and builds.
Beyond Good & Evil leans Optimization (Practiced Mastery); Marvel: Ultimate Alliance 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.
Beyond Good & Evil
Light combat, stealth timing, and hovercraft racing
Marvel: Ultimate Alliance
brawling and dodge timing are forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Beyond Good & Evil
Guards follow fixed patrol scripts
Marvel: Ultimate Alliance
enemies are scripted mobs
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Beyond Good & Evil
First-run photo hunts and story beats
Marvel: Ultimate Alliance
some loot and unlock randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Beyond Good & Evil
Stealth routes, pearls economy, and puzzles
Marvel: Ultimate Alliance
team bonuses, gear, and skill builds carry difficulty
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.