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
Co-op superhero brawler about assembling the right four-hero squad and builds.

Optimization · Practiced Mastery
An open-world crime game where managing a criminal empire's territory is the deeper system.
Marvel: Ultimate Alliance leans Optimization (Practiced Mastery); The Godfather II 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.
Marvel: Ultimate Alliance
brawling and dodge timing are forgiving
The Godfather II
shooting and brawling need moderate skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel: Ultimate Alliance
enemies are scripted mobs
The Godfather II
scripted rival families, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel: Ultimate Alliance
some loot and unlock randomness
The Godfather II
territory events and drops vary
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel: Ultimate Alliance
team bonuses, gear, and skill builds carry difficulty
The Godfather II
empire management and territory control solvable
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.