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
Punishing beat-em-up execution with zero margin and memorised stages.

Execution · Pure Mechanics
Spectacle hack-and-slash where reflexes and combo flow drive every fight.
Double Dragon III: The Sacred Stones leans Execution (Pure Mechanics); God of War III leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Double Dragon III: The Sacred Stones
Brutal difficulty and no continues punish every missed input
God of War III
Combo execution and QTE timing carry combat.
God of War III leans a little harder on reads, though the gap is small.
Double Dragon III: The Sacred Stones
Enemies attack in fixed scripted patterns
God of War III
Bosses fully scripted spectacle.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Double Dragon III: The Sacred Stones
Stages never change between attempts
God of War III
Almost no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Double Dragon III: The Sacred Stones
Character-swap management and memorised layouts are the path through
God of War III
Upgrade paths short and obvious.
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.