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

Execution · Practiced Mastery
A forgiving brawler-platformer where hijacking the right monster is the only decision.

Execution · Practiced Mastery
A family-tuned brawler-platformer testing modest timing and simple puzzle solutions.
Crash of the Titans leans Execution (Practiced Mastery); Knack II 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.
Crash of the Titans
Combo brawling and titan-jacking need light timing
Knack II
Light combo timing and platforming pitched at families
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Crash of the Titans
Titans are scripted mounts, not minds
Knack II
Enemies run simple scripts without adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Crash of the Titans
Levels are linear and fixed
Knack II
Levels are fixed with nothing hidden beyond first sight
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Crash of the Titans
Choosing which titan to ride is shallow strategy
Knack II
Size-swap puzzles have single obvious solutions
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.