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

Execution · Competitive PvP
The toned-down crossover fighter matching Mortal Kombat's roster against DC superheroes.

Execution · Competitive PvP
A genuine fighting game testing execution and opponent conditioning under anime skin.
Mortal Kombat vs. DC Universe leans Execution (Competitive PvP); Super Dragon Ball Z 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.
Mortal Kombat vs. DC Universe
Juggle combos and klose kombat timing
Super Dragon Ball Z
Street Fighter pedigree shows - spacing and combo execution rule
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat vs. DC Universe
Human mixups, though a simpler toolset than peers
Super Dragon Ball Z
Human opponents must be conditioned and baited
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat vs. DC Universe
Deterministic crossover combat
Super Dragon Ball Z
Nothing hidden once movesets are learned
Mortal Kombat vs. DC Universe leans a little harder on optimization, though the gap is small.
Mortal Kombat vs. DC Universe
Mapping juggle routes and matchup tools rewards practice
Super Dragon Ball Z
Skill-tree customisation and matchup study reward lab time
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.