head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
Spectacle hack-and-slash where reflexes and combo flow drive every fight.

Execution · Practiced Mastery
Two Spider-Men, faster traversal, and deeper combo systems.
God of War III leans Execution (Pure Mechanics); Marvel's Spider-Man 2 leans Execution (Practiced Mastery).
God of War III leans a little harder on execution, though the gap is small.
God of War III
Combo execution and QTE timing carry combat.
Marvel's Spider-Man 2
Symbiote and dual-hero combat demands inputs.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
God of War III
Bosses fully scripted spectacle.
Marvel's Spider-Man 2
Enemies scripted, not modeling player.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
God of War III
Almost no randomness.
Marvel's Spider-Man 2
Light open-world randomness.
Marvel's Spider-Man 2 leans a little harder on optimization, though the gap is small.
God of War III
Upgrade paths short and obvious.
Marvel's Spider-Man 2
Expanded skill trees and gadget combos 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.