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
The second Versus-series crossover, escalating tag-team chaos with assists and screen-filling supers.

Execution · Grand Arena
A variation-based fighter where character specialisation choices and read-and-punish execution drive competitive outcomes.
Marvel Super Heroes vs. Street Fighter leans Execution (Competitive PvP); Mortal Kombat X leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel Super Heroes vs. Street Fighter
Long air chains, assists, and infinites set a high physical bar.
Mortal Kombat X
Variation-specific combo routes demand precise practice
Mortal Kombat X leans a little harder on reads, though the gap is small.
Marvel Super Heroes vs. Street Fighter
Tag and assist mixups against adapting humans drive wins.
Mortal Kombat X
Reading opponent's variation choice and tendency shifts the matchup
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel Super Heroes vs. Street Fighter
Deterministic chaos; everything visible.
Mortal Kombat X
No RNG; transparent match flow
Mortal Kombat X leans a little harder on optimization, though the gap is small.
Marvel Super Heroes vs. Street Fighter
Team synergy and touch-of-death routes are deeply solvable.
Mortal Kombat X
Variation selection and optimal punish routes require systematic study
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.