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
Frame-perfect execution fused with constant prediction of an adapting human opponent.
Skullgirls leans Execution (Grand Arena); Ultra Street Fighter IV 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
Ultra Street Fighter IV
One-frame links and FADC timing set a brutal hands ceiling
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
Ultra Street Fighter IV
Footsies and conditioning the human opponent is the core duel
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
Ultra Street Fighter IV
Almost nothing hidden once both characters are known
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
Ultra Street Fighter IV
Frame data, matchups and option-selects form deep studied 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.