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
An anime arena fighter testing reactions and reading human mixups.

Execution · Competitive PvP
The toned-down crossover fighter matching Mortal Kombat's roster against DC superheroes.
Bleach: Rebirth of Souls 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.
Bleach: Rebirth of Souls
Reaction speed and combo timing gate versus play
Mortal Kombat vs. DC Universe
Juggle combos and klose kombat timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bleach: Rebirth of Souls
Human opponents mix up reversals and baits
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.
Bleach: Rebirth of Souls
Nothing meaningful is random between rounds
Mortal Kombat vs. DC Universe
Deterministic crossover combat
Mortal Kombat vs. DC Universe leans a little harder on optimization, though the gap is small.
Bleach: Rebirth of Souls
Character matchups and kikon routes are labbed knowledge
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.