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

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

Execution · Practiced Mastery
Sonic alternates breakneck daytime boost stages with brawling night levels as the Werehog.
God of War III leans Execution (Pure Mechanics); Sonic Unleashed 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.
God of War III
Combo execution and QTE timing carry combat.
Sonic Unleashed
Daytime boost stages demand reaction-speed precision
God of War III leans a little harder on reads, though the gap is small.
God of War III
Bosses fully scripted spectacle.
Sonic Unleashed
Scripted enemies in both forms
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.
Sonic Unleashed
First-run stage hazards arrive fast and unseen
Sonic Unleashed leans a little harder on optimization, though the gap is small.
God of War III
Upgrade paths short and obvious.
Sonic Unleashed
S-rank routes and Werehog combat upgrades are 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.