head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
MMA fighting sim where feints and stamina discipline decide layered striking and grappling exchanges.

Execution · Competitive PvP
The toned-down crossover fighter matching Mortal Kombat's roster against DC superheroes.
EA Sports UFC 4 leans Execution (Competitive PvP); Mortal Kombat vs. DC Universe 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.
EA Sports UFC 4
Strike timing, head movement, and grapple inputs
Mortal Kombat vs. DC Universe
Juggle combos and klose kombat timing
EA Sports UFC 4 leans a little harder on reads, though the gap is small.
EA Sports UFC 4
Feinting and baiting adaptive human opponents
Mortal Kombat vs. DC Universe
Human mixups, though a simpler toolset than peers
EA Sports UFC 4 leans a little harder on variance, though the gap is small.
EA Sports UFC 4
Little hidden information in the octagon
Mortal Kombat vs. DC Universe
Deterministic crossover combat
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
EA Sports UFC 4
Stamina management and matchup game-planning
Mortal Kombat vs. DC Universe
Mapping juggle routes and matchup tools rewards practice
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.