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 licensed brawler testing combat timing and memorised boss patterns.

Execution · Practiced Mastery
A retro-styled action platformer with pogo-stick combat.
Dragon Ball: Revenge of King Piccolo leans Execution (Practiced Mastery); Shovel Knight 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.
Dragon Ball: Revenge of King Piccolo
Combo timing and platforming reflexes carry the levels
Shovel Knight
Pogo combat and platforming need timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball: Revenge of King Piccolo
Bosses run scripted patterns, never adapt
Shovel Knight
Scripted boss patterns, not reads
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball: Revenge of King Piccolo
Level content is fixed after one playthrough
Shovel Knight
Deterministic stages
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball: Revenge of King Piccolo
Learning boss movesets and stage routes is the rest
Shovel Knight
Relic and upgrade choices shape runs
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.