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
Precision sniping and arena navigation through fixed, gimmick-laden levels.

Execution · Practiced Mastery
Pointer accuracy against memorized enemy spawns on fixed rails.
MDK leans Execution (Practiced Mastery); Resident Evil: The Darkside Chronicles 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.
MDK
Sniper-mode precision and arena dodging demand steady hands
Resident Evil: The Darkside Chronicles
Pointer accuracy on weak points is the whole input
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
MDK
Alien enemies behave on fixed scripts
Resident Evil: The Darkside Chronicles
Zombies arrive on a fixed rail script
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
MDK
Levels are authored with nothing random
Resident Evil: The Darkside Chronicles
Spawns repeat identically every playthrough
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
MDK
Learning arena gimmicks and item use solves each level
Resident Evil: The Darkside Chronicles
Weapon upgrades and memorized spawn order raise scores
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.