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.

Reads · Grand Arena
A reads-heavy neutral game where V-System decisions and opponent modelling decide bouts.

Execution · Grand Arena
A hyper-fast tag fighting game defined by three-character teams and touch-of-death combos.
Street Fighter V leans Reads (Grand Arena); Ultimate Marvel vs. Capcom 3 leans Execution (Grand Arena).
Ultimate Marvel vs. Capcom 3 leans a little harder on execution, though the gap is small.
Street Fighter V
V-Trigger combos and meaty setups require solid execution
Ultimate Marvel vs. Capcom 3
Long touch-of-death combos demand elite hands
Street Fighter V leans a little harder on reads, though the gap is small.
Street Fighter V
V-System neutral game heavily rewards opponent habit exploitation
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 V
No RNG; match flow is entirely player-driven
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 V
Season-by-season tier lists and V-Skill routing reward study
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.