head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Competitive PvP
Arc System Works' Dungeon Fighter spinoff where an MP meter turns specials into a resource economy.

Execution · Competitive PvP
The Deadly Alliance follow-up adding combo breakers, death traps, and online play.
DNF Duel leans Execution (Competitive PvP); Mortal Kombat: Deception leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
DNF Duel
MP skill combos are lenient but conversions still need hands.
Mortal Kombat: Deception
Style strings plus stage-hazard spacing demand control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
DNF Duel
White-damage pressure and Awakening baits drive human yomi.
Mortal Kombat: Deception
Human opponents bait death traps and breakers
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
DNF Duel
Deterministic systems throughout.
Mortal Kombat: Deception
Deterministic outside known stage hazards
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
DNF Duel
MP economy management is the distinctive solvable layer.
Mortal Kombat: Deception
Combo routes and hazard positioning are lab work
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.