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
Crossover fighting game where groove systems and footsies meet deep execution demands.

Execution · Grand Arena
A superhero fighter with gear-based customisation where execution and opponent reads sit atop a deep optimisation layer.
Capcom vs. SNK 2: Mark of the Millennium 2001 leans Execution (Grand Arena); Injustice 2 leans Execution (Grand Arena).
Capcom vs. SNK 2: Mark of the Millennium 2001 leans a little harder on execution, though the gap is small.
Capcom vs. SNK 2: Mark of the Millennium 2001
Strict links, roll cancels, groove mechanics
Injustice 2
Supermove confirms and precise character-specific combos demand execution
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Capcom vs. SNK 2: Mark of the Millennium 2001
Footsies and conditioning against adapting humans
Injustice 2
Meter burn mix-ups and opponent tendency tracking are constant
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Capcom vs. SNK 2: Mark of the Millennium 2001
Almost no randomness in matches
Injustice 2
No RNG; transparent match states
Injustice 2 leans a little harder on optimization, though the gap is small.
Capcom vs. SNK 2: Mark of the Millennium 2001
Groove selection, team order, matchup theory
Injustice 2
Gear stat distribution and character sub-archetype selection reward planning
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.