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
A 2D fighting game where execution meets relentless yomi at neutral.

Execution · Grand Arena
A hyper-fast tag fighting game defined by three-character teams and touch-of-death combos.
Street Fighter 6 leans Execution (Grand Arena); Ultimate Marvel vs. Capcom 3 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.
Street Fighter 6
Frame-perfect inputs and combos are mandatory.
Ultimate Marvel vs. Capcom 3
Long touch-of-death combos demand elite hands
Street Fighter 6 leans a little harder on reads, though the gap is small.
Street Fighter 6
Adaptive opponent baits Drive Impacts and throws.
Ultimate Marvel vs. Capcom 3
Mixups and assist baits versus adapting humans
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter 6
Essentially no randomness in match outcomes.
Ultimate Marvel vs. Capcom 3
Almost fully deterministic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter 6
Matchup charts, frame data, and combo routes.
Ultimate Marvel vs. Capcom 3
Team composition and matchup knowledge run 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.