head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, 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
Free-to-play hero shooter where loadout cards customize champions in objective team fights.
Mortal Kombat vs. DC Universe leans Execution (Competitive PvP); Paladins 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
Paladins
Hitscan aim and ability timing in firefights
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
Paladins
Human teams flank, bait ults, and adapt
Paladins leans a little harder on variance, though the gap is small.
Mortal Kombat vs. DC Universe
Deterministic crossover combat
Paladins
Card draft order adds mild run variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat vs. DC Universe
Mapping juggle routes and matchup tools rewards practice
Paladins
Loadout card builds and item counter-buying
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.