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

Execution · Grand Arena
A technically rich tag fighter where assist-driven combos and team synergy optimisation reward deep practice.

Execution · Grand Arena
Frantic tag-team fighter crossing Capcom's mutants with World Warriors.
Skullgirls leans Execution (Grand Arena); X-Men vs. Street Fighter 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.
Skullgirls
Long Blockbuster extensions and precise assist calls demand high motor skill
X-Men vs. Street Fighter
Infinite combos and tag execution demand serious hands.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Skullgirls
Team composition reads and opponent tendency tracking are constant
X-Men vs. Street Fighter
Human opponents adapt mixups every round.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Skullgirls
No RNG; all information is transparent
X-Men vs. Street Fighter
Fully visible game state.
Skullgirls leans a little harder on optimization, though the gap is small.
Skullgirls
Ratio team building and combo routing are extensively optimised by the community
X-Men vs. Street Fighter
Team synergy and matchup theory reward lab time.
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.