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
Momentum-driven execution over fixed levels rewarding memorised routes.

Execution · Practiced Mastery
A rail shooter testing reflex execution against fully memorisable enemy waves.
Sonic the Hedgehog 3 leans Execution (Practiced Mastery); Star Fox 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.
Sonic the Hedgehog 3
Holding speed through fixed hazards demands sharp reactions
Star Fox
Dodging, shooting and barrel rolls on rails demand reflexes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic the Hedgehog 3
Badniks and bosses repeat identical scripts
Star Fox
Every enemy wave is a fixed scripted pattern
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic the Hedgehog 3
Levels never change between runs
Star Fox
Routes and spawns are deterministic per path
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic the Hedgehog 3
Route choice and emerald collection reward memorised play
Star Fox
Memorising wave patterns and route choices for score
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.