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
Navigating hand-painted levels in rhythm with fixed musical hazard patterns.

Execution · Practiced Mastery
Precision sniping and arena navigation through fixed, gimmick-laden levels.
Beatbuddy: Tale of the Guardians leans Execution (Practiced Mastery); MDK 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.
Beatbuddy: Tale of the Guardians
Moving and dodging on the beat carries every section
MDK
Sniper-mode precision and arena dodging demand steady hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Beatbuddy: Tale of the Guardians
Hazards pulse to fixed musical patterns
MDK
Alien enemies behave on fixed scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Beatbuddy: Tale of the Guardians
Levels and rhythms are fully deterministic
MDK
Levels are authored with nothing random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Beatbuddy: Tale of the Guardians
Puzzle rooms and route memory add a light systems layer
MDK
Learning arena gimmicks and item use solves each level
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.