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
Arcade wrestling that tests grapple timing and baiting a human into bad pins.

Execution · Competitive PvP
The toned-down crossover fighter matching Mortal Kombat's roster against DC superheroes.
3 Count Bout 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.
3 Count Bout
Grapple timing and button mashing decide most exchanges
Mortal Kombat vs. DC Universe
Juggle combos and klose kombat timing
Mortal Kombat vs. DC Universe leans a little harder on reads, though the gap is small.
3 Count Bout
Human opponents bait grapples and pins unpredictably
Mortal Kombat vs. DC Universe
Human mixups, though a simpler toolset than peers
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
3 Count Bout
Nothing hidden in the ring
Mortal Kombat vs. DC Universe
Deterministic crossover combat
Mortal Kombat vs. DC Universe leans a little harder on optimization, though the gap is small.
3 Count Bout
Hidden moves and wrestler matchup knowledge reward study
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.