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
Twitch ball control plus constant prediction of human defenders on known maps.
Mortal Kombat vs. DC Universe leans Execution (Competitive PvP); TagPro 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
TagPro
Ball handling, boosts and juke precision decide grabs
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
TagPro
Human defenders adapt to your routes every match
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
TagPro
Maps and power-up timers are fully visible
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
TagPro
Map routes, button plays and power-up timing are studyable
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.