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

Execution · Competitive PvP
Lab-honed combo execution plus live mixup guessing against adapting human opponents.
Marvel vs. Capcom 2: New Age of Heroes leans Execution (Grand Arena); Skullgirls: 2nd Encore 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.
Marvel vs. Capcom 2: New Age of Heroes
infinite combos and assist timing demand elite hands
Skullgirls: 2nd Encore
Long combo routes and tight conversions demand serious hands
Marvel vs. Capcom 2: New Age of Heroes leans a little harder on reads, though the gap is small.
Marvel vs. Capcom 2: New Age of Heroes
humans bait assists and mix high-low constantly
Skullgirls: 2nd Encore
Mixups and resets only work by out-guessing a human
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
Skullgirls: 2nd Encore
Fully deterministic fighter with nothing hidden
Marvel vs. Capcom 2: New Age of Heroes leans a little harder on optimization, though the gap is small.
Marvel vs. Capcom 2: New Age of Heroes
team order, assist synergy, and matchup knowledge
Skullgirls: 2nd Encore
Team composition, assists and combo theory go deep
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.