head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Grand Arena
Chaotic tag fighter whose top tiers reward blistering execution and assist mastery.

Execution · Grand Arena
A combo-heavy fighter where landing punishes and reading opponent wake-up choices decide rounds.
Marvel vs. Capcom 2: New Age of Heroes leans Execution (Grand Arena); Mortal Kombat 9 leans Execution (Grand Arena).
Marvel vs. Capcom 2: New Age of Heroes leans a little harder on execution, though the gap is small.
Marvel vs. Capcom 2: New Age of Heroes
infinite combos and assist timing demand elite hands
Mortal Kombat 9
X-Ray setups and long combo strings require tight execution
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel vs. Capcom 2: New Age of Heroes
humans bait assists and mix high-low constantly
Mortal Kombat 9
Opponents adapt wake-up and zoning tendencies across a match
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel vs. Capcom 2: New Age of Heroes
fully deterministic engine
Mortal Kombat 9
No RNG; all outcomes are player-driven
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel vs. Capcom 2: New Age of Heroes
team order, assist synergy, and matchup knowledge
Mortal Kombat 9
Matchup knowledge and X-Ray confirm windows reward structured 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.