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
Team hero shooter blending FPS mechanics with ability economy mind games.
Capcom vs. SNK 2: Mark of the Millennium 2001 leans Execution (Grand Arena); Overwatch 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
Overwatch
Hero aim, movement, and ability timing
Capcom vs. SNK 2: Mark of the Millennium 2001 leans a little harder on reads, though the gap is small.
Capcom vs. SNK 2: Mark of the Millennium 2001
Footsies and conditioning against adapting humans
Overwatch
Ult tracking, flanks, and baiting human teams
Overwatch leans a little harder on variance, though the gap is small.
Capcom vs. SNK 2: Mark of the Millennium 2001
Almost no randomness in matches
Overwatch
Minor spread and matchmaking noise
Same score on optimization - 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
Groove selection, team order, matchup theory
Overwatch
Team comps, ult economy, and positioning theory
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.