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
An anthology of bite-sized Kirby adventures with deep copy abilities and co-op helpers.

Execution · Practiced Mastery
A 3D Sonic where you swap between three-character team formations mid-level.
Kirby Super Star leans Execution (Practiced Mastery); Sonic Heroes 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.
Kirby Super Star
Helper juggling and The Arena demand competence
Sonic Heroes
Speed sections punish sloppy control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby Super Star
Pattern-based bosses throughout
Sonic Heroes
Scripted enemies only
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby Super Star
Treasure locations in Great Cave are fixed
Sonic Heroes
Fixed level layouts
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby Super Star
Ability matchups and boss patterns reward learning
Sonic Heroes
Team-formation switching and rank routes
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.