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 versus fighter testing motion-input execution and live opponent prediction.
Mortal Kombat vs. DC Universe leans Execution (Competitive PvP); Teenage Mutant Ninja Turtles: Tournament Fighters 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
Teenage Mutant Ninja Turtles: Tournament Fighters
Special-move inputs and punish timing decide exchanges
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
Teenage Mutant Ninja Turtles: Tournament Fighters
Human opponents adapt and bait every round
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
Teenage Mutant Ninja Turtles: Tournament Fighters
Nothing hidden once both characters are known
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
Teenage Mutant Ninja Turtles: Tournament Fighters
Matchup knowledge and move properties underpin play
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.
full breakdown
Mortal Kombat vs. DC Universe →
full breakdown
Teenage Mutant Ninja Turtles: Tournament Fighters →